Zuxiao Zhang, Xiaojun Tang and William R. Dolbier, Jr.* Department of Chemistry, University of Florida, Gainesville, FL

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1 Photoredox-Catalyzed Intramolecular Difluoromethylation of -Benzylacrylamides Coupled with a Dearomatizing Spirocyclization: Access to CF2H Containing 2- Azaspiro[4.5]deca-6,9-diene-3,8-diones. Zuxiao Zhang, Xiaojun Tang and William R. Dolbier, Jr.* Department of Chemistry, University of Florida, Gainesville, FL Supporting Information Table of Contents I, General information (S2) II, Characterization of starting materials (S3-S9) III, Experimental procedures and data (S9-S20) IV, References (S21) V, MR Spectra for new compounds (S22-S141) 1

2 I. General information: All reactions were carried out under 2 atmosphere. All anhydrous solvents were purchased from Aldrich and stored over 4A molecular sieves. Reagents were purchased at commercial quality and were used without further purification. All MR spectra were run using CDCl 3 as solvent, unless otherwise specified. 1 H MR spectra were recorded at 500 MHz or 300 MHz, and chemical shifts are reported in ppm relative to TMS. 19 F MR spectra were recorded at 282 MHz, and chemical shifts are reported in ppm relative to CFCl 3 as the external standard. 13 C MR spectra were recorded at 125 MHz or 75 MHz with proton decoupling, and chemical shifts are reported in ppm relative to CDCl 3 (-77.0 ppm) as the reference. The visible light was generated from a fluorescent light bulb (daylight GE Energy Smart, 26 W, 1600 lumens). n-c 4 F 9 S 2 Cl, CF 3 CH 2 S 2 Cl, BrCF 2 CEt and CF 3 S 2 Cl were purchased from Synquest or Aldrich. HCF 2 S 2 Cl and FCH 2 S 2 Clwere prepared according to literature procedures. 2

3 II. Characterization of starting materials 1. Synthesis of substrates All starting materials were prepared according to previously reported procedures. 1 Characterization of non-previously reported compounds is given. -tert-butyl--(4-methoxybenzyl)methacrylamide (1a) Me 1 H MR (500 MHz, CDCl 3 ) δ 7.12 (d, J = 8.3 Hz, 2H), 6.86 (d, J = 8.4 Hz, 2H), 5.01 (s, 1H), 4.93 (s, 1H), 4.60 (s, 2H), 3.79 (d, J = 0.9 Hz, 3H), 1.92 (s, 3H), 1.41 (s, 9H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s). HRMS (ESI) calcd for C 16 H (M+H + ): , found: (4-(benzyloxy)benzyl)--tert-butylmethacrylamide (1b) 1 H MR (500 MHz, CDCl 3 ) δ 7.43 (d, J = 7.0 Hz, 2H), (m, 2H), 7.33 (t, J = 7.2 Hz, 1H), 7.13 (d, J = 8.7 Hz, 2H), 6.95 (d, J = 8.7 Hz, 2H), Bn 5.05 (s, 2H), 5.02 (s, 1H), (m, 1H), 4.61 (s, 2H), 1.93 (s, 3H), 1.42 (s, 9H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s). HRMS (ESI) calcd for C 22 H (M+H + ): , found: tert-butyl--(4-(4-methoxybenzyloxy)benzyl)methacrylamide (1c) 1 H MR (500 MHz, CDCl 3 ) δ 7.37 (d, J = 8.7 Hz, 2H), 7.14 (d, J = 8.7 Hz, 2H), 6.95 (t, J = 9.0 Hz, 4H), 5.04 (s, 1H), 4.99 (s, 2H), (m, 1H), PMB 4.63 (s, 2H), 3.84 (s, 3H), 1.95 (d, J = 1.3 Hz, 3H), 1.44 (s, 9H). 13 C MR (126 MHz, CDCl 3 ) δ (m), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s),

4 (s), (s), (s), (s), (s). HRMS (ESI) calcd for C 23 H (M+H + ): , found: (4-(benzyloxy)benzyl)--butylmethacrylamide (1d) 1 H MR (500 MHz, CDCl 3 ) δ 7.43 (d, J = 7.1 Hz, 2H), 7.39 (t, J = 7.5 Hz, 2H), 7.33 (t, J = 7.2 Hz, 1H), 7.14 (d, J = 38.1 Hz, 2H), 6.94 (d, J = 7.8 Hz, Bn 2H), 5.14 (s, 1H), 5.05 (s, 3H), 4.55 (s, 2H), 3.26 (d, J = 38.6 Hz, 2H), 1.98 (s, 3H), (m, 2H), 1.24 (s, 2H), 0.89 (t, J = 7.2 Hz, 3H). 13 C MR (75 MHz, DMS) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s). HRMS (ESI) calcd for C 22 H (M+H + ): , found: (4-(benzyloxy)benzyl)--isopropylmethacrylamide (1e) 1 H MR (500 MHz, CDCl 3 ) δ 7.43 (d, J = 7.4 Hz, 2H), 7.38 (t, J = 7.5 Hz, 2H), 7.32 (t, J = 7.1 Hz, 1H), 7.18 (d, J = 6.6 Hz, 2H), 6.91 (d, J = 8.3 Hz, 2H), Bn 5.12 (s, 1H), 5.06 (s, 1H), 5.04 (s, 2H), 4.49 (s, 2H), 4.35 (s, 1H), 2.01 (s, 3H), 1.13 (d, J = 6.5 Hz, 6H). 13 C MR (75 MHz, DMS) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (m), (s). HRMS (ESI) calcd for C 21 H (M+H + ): , found: (4-(benzyloxy)benzyl)--cyclohexylmethacrylamide (1f) 1 H MR (300 MHz, DMS) δ 7.37 (ddd, J = 19.3, 14.1, 7.3 Hz, 5H), 7.15 (d, J = 8.5 Hz, 2H), 6.94 (d, J = 8.2 Hz, 2H), 5.11 (s, 1H), 5.04 (d, J = 13.6 Bn Hz, 2H), 4.99 (s, 1H), 4.45 (s, 2H), 3.76 (s, 1H), 1.90 (s, 3H), 1.65 (t, J = 14.7 Hz, 2H), 1.45 (dd, J = 28.0, 15.8 Hz, 5H), (m, 3H). 13 C MR (75 MHz, DMS) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s). HRMS (ESI) calcd for C 24 H (M+H + ): , found:

5 -(4-(benzyloxy)benzyl)--phenylmethacrylamide (1g) 1 H MR (500 MHz, CDCl 3 ) δ 7.42 (d, J = 7.0 Hz, 2H), 7.38 (t, J = 7.3 Hz, 2H), 7.32 (t, J = 7.1 Hz, 1H), 7.27 (d, J = 5.1 Hz, 1H), 7.22 (dd, J = 14.4, Bn 7.4 Hz, 2H), 7.14 (d, J = 8.4 Hz, 2H), (m, 2H), 6.87 (d, J = 8.5 Hz, 2H), 5.03 (s, 2H), 5.02 (s, 1H), 4.99 (d, J = 0.9 Hz, 1H), 4.90 (s, 2H), 1.77 (s, 3H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s). HRMS (ESI) calcd for C 24 H (M+H + ): , found: benzyl--(4-(benzyloxy)benzyl)methacrylamide (1h) 1 H MR (500 MHz, CDCl 3 ) δ 7.45 (d, J = 7.3 Hz, 2H), 7.40 (t, J = 7.5 Hz, 2H), (m, 4H), 7.15 (d, J = 35.3 Hz, 4H), 6.96 (s, 2H), 5.19 (s, 1H), 5.15 (s, 1H), 5.07 (s, 2H), 4.48 (d, J = 26.7 Hz, 4H), 2.03 (s, 3H). 13 C MR (75 MHz, DMS) δ (s), (s), (s), (s), (s), Bn (s), (s), (s), (s), (s), (m), (s), (s), (s), (s). HRMS (ESI) calcd for C 25 H 26 2 (M+H + ): , found: (4-(benzyloxy)benzyl)--methylmethacrylamide (1i) 1 H MR (300 MHz, DMS) δ (m, 5H), 7.15 (s, 2H), (m, 2H), 5.18 (s, 1H), 5.08 (s, 2H), 5.00 (s, 1H), 4.47 (s, 2H), (m, Bn 3H), 1.88 (s, 3H). 13 C MR (75 MHz, DMS) δ (s), (s), (s), (s), (s), (s), (s), (s). HRMS (ESI) calcd for C 19 H 22 2 (M+H + ): , found: (4-(benzyloxy)-3-methoxybenzyl)--tert-butylmethacrylamide (1j) 1 H MR (500 MHz, CDCl 3 ) δ 7.43 (d, J = 7.4 Hz, 2H), 7.36 (t, J = 7.4 Hz, Me Bn 2H), 7.30 (t, J = 7.3 Hz, 1H), 6.85 (d, J = 8.2 Hz, 1H), 6.75 (d, J = 1.8 Hz, 1H), 6.69 (dd, J = 8.2, 2.0 Hz, 1H), 5.13 (s, 2H), 5.01 (s, 1H), (m, 5

6 1H), 4.60 (s, 2H), 3.86 (s, 3H), 1.93 (s, 3H), 1.43 (s, 9H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s). HRMS (ESI) calcd for C 23 H (M+H + ): , found: (4-(benzyloxy)-3-fluorobenzyl)--tert-butylmethacrylamide (1k) F 1 H MR (500 MHz, CDCl 3 ) δ 7.43 (d, J = 7.4 Hz, 2H), 7.38 (t, J = 7.4 Hz, 2H), 7.32 (t, J = 7.2 Hz, 1H), 6.96 (dd, J = 15.2, 7.0 Hz, 2H), 6.89 (d, J = 8.3 Bn Hz, 1H), 5.12 (s, 2H), 4.99 (s, 1H), 4.93 (s, 1H), 4.58 (s, 2H), 1.91 (s, 3H), 1.42 (s, 9H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (d, J = Hz), (d, J = 10.9 Hz), (s), (s), (d, J = 5.4 Hz), (s), (s), (s), (d, J = 3.5 Hz), (d, J = 1.9 Hz), (d, J = 19.2 Hz), (s), (s), (s), (s), (d, J = 13.8 Hz), (s). 19 F MR (282 MHz, CDCl 3 ) δ (dd, J = 11.7, 8.3 Hz). HRMS (ESI) calcd for C 22 H 27 F + 2 (M+H + ): , found: (4-(benzyloxy)-3-chlorobenzyl)--tert-butylmethacrylamide (1l) Cl 1 H MR (500 MHz, CDCl 3 ) δ 7.46 (d, J = 7.4 Hz, 1H), 7.39 (t, J = 7.4 Hz, 1H), 7.33 (t, J = 7.3 Hz, 1H), 7.23 (d, J = 2.2 Hz, 1H), 7.04 (dd, J = 8.4, 2.2 Bn Hz, 1H), 6.94 (d, J = 8.5 Hz, 1H), 5.14 (s, 1H), 4.99 (s, 1H), (m, 1H), 4.58 (s, 1H), 1.92 (d, J = 1.1 Hz, 2H), 1.42 (s, 5H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s). HRMS (ESI) calcd C 22 H 27 Cl + 2, For (M+H + ): , found: (4-(benzyloxy)-3-bromobenzyl)--tert-butylmethacrylamide (1m) 1 H MR (500 MHz, CDCl 3 ) δ 7.47 (d, J = 7.5 Hz, 2H), (m, 3H), Br Bn 7.33 (t, J = 7.3 Hz, 1H), 7.09 (dd, J = 8.4, 2.2 Hz, 1H), 6.91 (d, J = 8.5 Hz, 1H), 5.14 (s, 2H), (m, 1H), (m, 1H), 4.58 (s, 2H), (m, 3H), 1.42 (s, 9H). 13 C MR (126 MHz, CDCl 3 ) δ (s), 6

7 (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s). HRMS (ESI) calcd for C 22 H 27 Br + 2 (M+H + ): , found: (4-(benzyloxy)-3,5-dimethoxybenzyl)--tert-butylmethacrylamide (1o) Me 1 H MR (500 MHz, CDCl 3 ) δ 7.46 (d, J = 7.0 Hz, 2H), (m, 2H), (m, 1H), 6.41 (s, 2H), 5.00 (d, J = 2.6 Hz, 3H), 4.95 (dd, J = 13.3, Bn 12.0 Hz, 1H), 4.61 (s, 2H), 3.79 (s, 6H), 1.93 (s, 3H), 1.45 (s, 9H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), Me (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s). HRMS (ESI) calcd for C 24 H (M+H + ): , found: (4-(benzyloxy)-3,5-dimethylbenzyl)--tert-butylmethacrylamide (1n) tbu Bn 1 H MR (500 MHz, CDCl 3 ) δ 7.47 (d, J = 6.9 Hz, 2H), 7.40 (t, J = 7.3 Hz, 2H), 7.35 (t, J = 7.2 Hz, 1H), 6.86 (s, 2H), 5.02 (s, 1H), 4.94 (s, 1H), 4.81 (s, 2H), 4.58 (s, 2H), 2.28 (s, 6H), 1.94 (s, 3H), 1.44 (s, 9H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (m), (s), (s), (s), (s), (s), (s), (s). HRMS (ESI) calcd for C 24 H (M+H + ): , found: ((4-(benzyloxy)naphthalen-1-yl)methyl)--tert-butylmethacrylamide (1p) tbu 1 H MR (500 MHz, CDCl 3 ) δ 8.45 (d, J = 8.2 Hz, 1H), 7.86 (d, J = 8.4 Hz, Bn 1H), (m, 4H), 7.45 (t, J = 7.4 Hz, 3H), 7.37 (dd, J = 18.3, 11.0 Hz, 1H), 6.94 (d, J = 7.9 Hz, 1H), 5.26 (s, 2H), 5.03 (s, 2H), 4.99 (s, 1H), 4.80 (s, 1H), 1.95 (s, 3H), 1.54 (s, 9H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), 7

8 (s), (s), (s), (s), (s), (s), (s), (s), (s). HRMS (ESI) calcd for C 26 H (M+H + ): , found: (4-(benzyloxy)benzyl)--tert-butylacrylamide (1q) 1 H MR (500 MHz, CDCl 3 ) δ 7.44 (d, J = 7.1 Hz, 2H), 7.39 (t, J = 7.5 Hz, 2H), 7.33 (t, J = 7.2 Hz, 1H), 7.15 (d, J = 8.5 Hz, 2H), 6.97 (d, J = 8.6 Hz, Bn 2H), 6.39 (dd, J = 16.6, 10.1 Hz, 1H), 6.30 (dd, J = 16.7, 2.3 Hz, 1H), 5.54 (dd, J = 10.1, 2.3 Hz, 1H), 5.06 (s, 2H), 4.57 (s, 2H), 1.45 (s, 9H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s). HRMS (ESI) calcd for C 21 H (M+H + ): , found: Synthesis of mono and difluoromethyl sulfonyl chloride The Difluoromethyl sulfonyl chloride was prepared according to literature procedures, and its 1 H MR and 19 F MR were consistent with those reported in the literature. 2 Cl SH i) ah ii) H 2CFCl SCH 2 F Cl 2 DMF, 70 C Cl H2/DCM, -10 C H 2 CFS 2 Cl SH 1.5 eq HCF 2 Cl 2.5 eq ah Hexanes/60 C 2 h S CF 2 H Cl 2, H 2-10 C HCF 2 S 2 Cl III. Experimental procedures and data fac-ir(ppy) 3 catalyzed difluoromethylation of -benzylacrylamides coupled with dearomatization To an oven-dried mm (8 ml) borosilicate vial equipped with a magnetic stirrer, were added -benzylacrylamide (64.6 mg, 0.2 mmol), fac-ir(ppy) 3 (2.4 mg, mmol, eq) and K 2 HP 4 (68 mg, 0.4 mmol, 2.0 equiv). To this mixture were added 2 ml CH 3 C, 8 mg deionized 8

9 water and CF 2 HS 2 Cl (60 mg, 0.4 mmol, 2 equiv) under a blanket of nitrogen. The vial was sealed, and stirred under visible light at room temperature for 18 hr. After this time, the CH 3 C was removed in vacuo, and the residue purified by column chromatography on silica gel eluting with hexanes/ethyl acetate (2:1). This gave product 2a as light yellow oil (48.7 mg, 82% yield). CF 2 H 2-tert-butyl-4-(2,2-difluoroethyl)-4-methyl-2-azaspiro[4.5]deca-6,9-diene-3,8- dione (2a) 1 H MR (500 MHz, CDCl 3 ) δ 6.86 (ddd, J = 8.4, 5.9, 3.0 Hz, 2H), 6.37 (ddd, J = 12.2, 10.0, 4.7 Hz, 2H), 6.08 (tdd, J = 56.4, 5.6, 3.6 Hz, 1H), 3.51 (d, J = 10.5 Hz, 1H), 3.27 (d, J = 10.5 Hz, 1H), (m, 1H), 1.68 (qd, J = 15.1, 5.7 Hz, 1H), 1.37 (s, 9H), 1.20 (s, 3H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (dd, J = 239.7, Hz), (s), (dd, J = 6.7, 3.0 Hz), (s), (s), (t, J = 22.4 Hz), (s), (d, J = 1.8 Hz). 19 F MR (282 MHz, CDCl 3 ) δ (AB, ddddd, J = 284.8, 38.7, 22.6, 15.5, 1.5 Hz, 1F), (AB, ddt, J = 287.6, 55.8, 14.6 Hz, 1F). HRMS (ESI) calcd for C 16 H 22 F (M+H + ): , found: butyl-4-(2,2-difluoroethyl)-4-methyl-2-azaspiro[4.5]deca-6,9-diene-3,8-dione (2d) Prepared according to general method and isolated in 83% yield after chromoatography as light yellow oil (49.5 mg): 1 H MR (500 MHz, CDCl 3 ) δ 6.87 (ddd, J = 17.0, 10.2, 3.0 Hz, 2H), 6.41 (ddd, J = 23.0, 10.0, 1.4 Hz, 2H), CF 2 H 6.14 (tdd, J = 56.2, 5.7, 3.4 Hz, 1H), 3.53 (d, J = 10.5 Hz, 1H), (m, 2H), 3.19 (d, J = 10.5 Hz, 1H), (m, 1H), 1.75 (ddd, J = 30.0, 15.2, 5.8 Hz, 1H), (m, 2H), 1.32 (dq, J = 14.6, 7.3 Hz, 2H), 1.26 (s, 3H), 0.93 (t, J = 7.3 Hz, 3H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (dd, J = 240.0, Hz), (s), (dd, J = 7.0, 2.8 Hz), (s), (s), (m), (s), (s), (d, J = 2.2 Hz), (s). 19 F MR (282 MHz, CDCl 3 ) δ (AB, ddddd, J = 288.2, 23.8, 17.3, 16.0, 1.9 Hz, 1F), (AB, ddt, J = 288.2, 55.8, 14.3 Hz, 1F). HRMS (ESI) calcd for C 16 H 22 F (M+H + ): , found:

10 diene-3,8-dione (2f) Prepared according to general method and isolated in 80% yield after CF 2 H chromoatography as yellow oil (51.7 mg): 1 H MR (500 MHz, CDCl 3 ) δ 6.87 (dd, J = 10.2, 3.1 Hz, 1H), 6.83 (dd, J = 10.2, 3.1 Hz, 1H), 6.42 (dd, J = 10.2, 1.9 Hz, 1H), 6.37 (dd, J = 10.2, 1.9 Hz, 1H), 6.13 (tdd, J = 55.9, 5.7, 3.4 Hz, 1H), 3.95 (tt, J = 11.6, 3.7 Hz, 1H), 3.44 (d, J = 10.5 Hz, 1H), 3.19 (d, J = 10.5 Hz, 1H), (m, 1H), (m, 6H), (m, 4H), 1.24 (d, J = 1.5 Hz, 3H), (m, 1H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (dd, J = 239.9, Hz), (s), (dd, J = 6.9, 3.0 Hz), (s), (s), (m), (s), (s), (s), (s), (s), (d, J = 2.1 Hz). 19 F MR (282 MHz, CDCl 3 ) δ (AB, ddddd, J = 287.9, 56.5, 23.4, 15.7, 1.8 Hz, 1F), (AB, ddt, J = 287.9, 55.9, 14.6 Hz, 1F). HRMS (ESI) calcd for C 18 H 24 F (M+H + ): , found: (2,2-difluoroethyl)-2-isopropyl-4-methyl-2-azaspiro[4.5]deca-6,9- diene-3,8-dione (2e) Prepared according to general method and isolated in 82% yield after chromoatography as light yellow oil (46.5 mg): 1 H MR (500 MHz, CDCl 3 ) δ CF 2 H 6.88 (dd, J = 10.2, 3.0 Hz, 1H), 6.83 (dd, J = 10.2, 3.1 Hz, 1H), 6.43 (dd, J = 10.3, 1.8 Hz, 1H), 6.39 (dd, J = 10.2, 1.8 Hz, 1H), 6.14 (tdd, J = 56.3, 5.7, 3.4 Hz, 1H), 4.38 (hept, J = 6.8 Hz, 1H), 3.43 (d, J = 10.5 Hz, 1H), 3.17 (d, J = 10.5 Hz, 1H), (m, 1H), 1.74 (qd, J = 15.1, 5.8 Hz, 1H), 1.25 (d, J = 1.4 Hz, 3H), 1.14 (t, J = 7.0 Hz, 6H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (dd, J = 239.9, Hz), (dd, J = 6.8, 3.0 Hz), (s), (s), (s), (m), (s), (s), (d, J = 2.1 Hz). 19 F MR (282 MHz, CDCl 3 ) δ (AB, ddddd, J = 287.9, 56.6, 23.4, 15.7, 1.7 Hz, 1F), (AB, ddt, J = 287.9, 55.8, 14.6 Hz, 1F). HRMS (ESI) calcd for C 15 H 20 F (M+H + ): , found: cyclohexyl-4-(2,2-difluoroethyl)-4-methyl-2-azaspiro[4.5]deca-6,9-4-(2,2-difluoroethyl)-4-methyl-2-phenyl-2-azaspiro[4.5]deca-6,9-diene- 3,8-dione (2g) CF 2 H Prepared according to general method and isolated in 48% yield after chromoatography as yellow oil (30.4 mg): 1 H MR (500 MHz, CDCl 3 ) δ 7.57 (dd, J = 8.7, 1.1 Hz, 2H), (m, 2H), (m, 1H), 7.00 (dd, J 10

11 = 10.5, 2.0 Hz, 2H), (m, 2H), 6.20 (tdd, J = 55.7, 5.8, 3.4 Hz, 1H), 4.03 (d, J = 10.4 Hz, 1H), 3.69 (d, J = 10.4 Hz, 1H), (m, 1H), 1.89 (ddd, J = 30.1, 15.1, 5.8 Hz, 1H), 1.41 (d, J = 1.7 Hz, 3H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (dd, J = 240.2, Hz), (s), (dd, J = 7.0, 2.9 Hz), (s), (dd, J = 23.2, 22.3 Hz), (d, J = 2.3 Hz). 19 F MR (282 MHz, CDCl 3 ) δ (AB, ddddd, J = 287.9, 56.5, 23.5, 15.6, 1.9 Hz, 1F), (AB, ddt, J = 287.9, 55.6, 14.3 Hz, 1F).HRMS (ESI) calcd for C 18 H 18 F (M+H + ): , found: (4-(benzyloxy)benzyl)-3-(2,2-difluoroethyl)-3-methylindolin-2-one (2g ) Bn Prepared according to general method and isolated in 50% yield after chromoatography as yellow oil (41.0 mg): 1 H MR (500 MHz, CDCl 3 ) δ 7.37 (ddd, J = 27.9, 14.0, 7.0 Hz, 5H), (m, 4H), 7.06 (t, J = 7.5 Hz, 1H), 6.93 (d, J = 8.6 Hz, 2H), 6.79 (d, J = 7.8 Hz, 1H), 5.61 (tdd, J = CF 2 H 56.1, 6.4, 3.3 Hz, 1H), 5.03 (s, 2H), 4.93 (d, J = 15.4 Hz, 1H), 4.81 (d, J = 15.4 Hz, 1H), 2.59 (qd, J = 14.2, 6.6 Hz, 1H), (m, 1H), 1.46 (s, 3H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (t, J = Hz), (s), (s), (s), (t, J = 5.3 Hz), (s), (t, J = 21.9 Hz), (s). 19 F MR (282 MHz, CDCl 3 ) δ (ddd, J = 56.0, 14.5, 4.2 Hz δ (dd, J = 56.1, 14.8 Hz). HRMS (ESI) calcd for C 25 H 24 F 2 2 (M+H + ): , found: benzyl-4-(2,2-difluoroethyl)-4-methyl-2-azaspiro[4.5]deca-6,9-diene- 3,8-dione (2h) Bn CF 2 H Prepared according to general method and isolated in 82% yield after chromoatography as yellow oil (54.4 mg): 1 H MR (500 MHz, CDCl 3 ) δ (m, 3H), 7.23 (d, J = 6.8 Hz, 2H), 6.79 (ddd, J = 16.9, 10.2, 3.1 Hz, 2H), 6.39 (dd, J = 10.2, 1.8 Hz, 1H), 6.33 (dd, J = 10.1, 1.8 Hz, 1H), 6.19 (tdd, J = 56.1, 5.8, 3.4 Hz, 1H), 4.55 (d, J = 14.5 Hz, 1H), 4.45 (d, J = 14.4 Hz, 1H), 3.36 (d, J = 10.6 Hz, 1H), 3.06 (d, J = 10.6 Hz, 1H), (m, 1H), 1.79 (qd, J = 15.2, 5.8 Hz, 1H), 1.28 (d, J = 1.5 Hz, 3H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (dd, J = 240.1, Hz), (s), (dd, J = 7.0, 2.8 Hz), (s), (s), (m), (d, J = 2.1 Hz). 19 F MR (282 MHz, 11

12 CDCl 3 ) δ (AB, ddddd, J = , 56.4, 23.5, 15.6, 1.6 Hz, 1F), (AB, ddt, J = , 55.8, 14.4 Hz, 1F). HRMS (ESI) calcd for C 19 H 20 F (M+H + ): , found: tert-butyl-4-(2,2-difluoroethyl)-7-methoxy-4-methyl-2-azaspiro[4.5]deca-6,9-diene-3,8-dione (2j) Prepared according to general method and isolated in 76% yield after chromoatography as yellow oil (50.0 mg): 1 H MR (500 MHz, CDCl 3 ) δ Me 6.90 (ddd, J = 12.9, 10.1, 2.7 Hz, 1H (both isomers)), 6.44 (dd, J = 12.0, 10.2 CF 2 H Hz, 1H (both isomers)), (m, 1H (isomers A)), δ 6.09 (tdd, J = 56.0, 5.5, 3.5 Hz, 1H (isomers B)), 5.69 (dd, J = 14.1, 2.6 Hz, 1H (isomers A)), 5.68 (d, J = 2.6 Hz, 1H (isomers B)), 3.70 (s, 1H (isomers A)), 3.68 (s, 3H (isomers B)), 3.56 (d, J = 10.5 Hz, 1H (isomers A)), 3.54 (d, J = 10.5 Hz, 1H (isomers B)), 3.36 (d, J = 10.4 Hz, 1H (isomers A)), 3.28 (d, J = 10.4 Hz, 1H (isomers B)), (m, 1H (both isomers)), (m, 1H (both isomers)), 1.42 (s, 9H (isomers A)), 1.41 (s, 9H (isomers B)), 1.27 (d, J = 1.7 Hz, 3H (isomers A)), 1.19 (s, 3H (isomers B)). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (dd, J = 239.9, Hz), δ (dd, J = 239.8, Hz), (s), (s), (s), (s), (s), (s), (dd, J = 6.2, 3.4 Hz), (dd, J = 6.5, 3.1 Hz), (s), (s), (t, J = 22.4 Hz), (t, J = 22.3 Hz), (d, J = 1.6 Hz), (s), (s) F MR (282 MHz, CDCl 3 ) δ (m). HRMS (ESI) calcd for C 17 H 24 F 2 3 (M+H + ): , found: F 2-tert-butyl-4-(2,2-difluoroethyl)-7-fluoro-4-methyl-2- azaspiro[4.5]deca-6,9-diene-3,8-dione (2k) Prepared according to general method and isolated in 77% yield after CF 2 H chromoatography as pale yellow oil (48.6 mg): 1 H MR (500 MHz, CDCl 3 ) δ 6.91 (td, J = 9.7, 2.7 Hz, 1H (both isomers)), (m, 2H (both isomers)), 6.14 (tdd, J = 56.4, 6.1, 2.8 Hz, 1H (isomers A)), 6.10 (tdd, J = 56.2, 5.7, 3.2 Hz, 1H (isomers B)), 3.58 (d, J = 10.6 Hz, 1H (isomers A)), 3.56 (dd, J = 10.5, 1.2 Hz, 1H (isomers B)), 3.38 (d, J = 10.6 Hz, 1H (isomers A)), 3.32 (d, J = 10.6 Hz, 1H (isomers B)), (m, 1H (both isomers)), (m, 1H (both isomers) ), 1.40 (s, 9H (both isomers)), 1.24 (s, 3H (isomers A)), 1.21 (s, 3H (isomers B)). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (d, J = 48.5 Hz), (d, J = 48.4 Hz), (d, J = 2.1 Hz), (d, J = 2.1 Hz), (d, J = 4.5 Hz), (d, J = 4.6 Hz), (d, J = 13.9 Hz), (d, J = 14.7 Hz), (m), (s), (s), (m), (s), (t, J = 2.9 Hz), (d, J = 5.2 Hz), (d, J = 5.5 Hz), (m),

13 37.86 (m), (s), (d, J = 2.3 Hz), (d, J = 2.1 Hz). 19 F MR (282 MHz, CDCl 3 ) δ (m, 2F), (dd, J = 13.1, 6.9 Hz, 1F (isomers A)), (dd, J = 13.0, 6.9 Hz 1F, (isomers B)). HRMS (ESI) calcd for C 16 H 21 F (M+H + ): , found: tert-butyl-7-chloro-4-(2,2-difluoroethyl)-4-methyl-2-azaspiro[4.5]deca-6,9-diene-3,8-dione (2l) Prepared according to general method and isolated in 84% yield after chromoatography as yellow oil (55.7 mg): 1 H MR (500 MHz, CDCl 3 ) δ 7.03 Cl (d, J = 1.6 Hz, 1H (both isomers)), 6.90 (td, J = 9.7, 2.7 Hz, 1H (both isomers)), CF 2 H 6.49 (dd, J = 14.0, 10.2 Hz, 1H (both isomers)), (m, 1H (both isomers)), 3.58 (d, J = 10.6 Hz, 1H (isomers A)), δ 3.55 (d, J = 10.7 Hz, 1H (isomers B)), 3.37 (d, J = 10.6 Hz, 1H (isomers A)), 3.33 (d, J = 10.6 Hz, 1H (isomers B)), (m, 1H (both isomers)), (m, 1H (both isomers)), 1.40 (s, 9H (isomers A)), 1.40 (s, 9H (isomers B)), 1.25 (s, 3H (isomers A)), 1.22 (s, 3H (isomers B)). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (dd, J = 239.9, Hz), δ (dd, J = 240.0, Hz), (s), (s), (dd, J = 7.0, 2.3 Hz), (dd, J = 7.3, 2.2 Hz), (s), (s), (s), (s), (dd, J = 22.1, 14.2 Hz), (dd, J = 23.1, 14.2 Hz), (s), (s), (s). 19 F MR (282 MHz, CDCl 3 ) δ (m). HRMS (ESI) calcd for C 16 H 21 ClF (M+H + ): , found: bromo-2-tert-butyl-4-(2,2-difluoroethyl)-4-methyl-2-azaspiro[4.5]deca-6,9-diene-3,8-dione (2m) Prepared according to general method and isolated in 61% yield after chromoatography as yellow oil (45.9 mg): 1 H MR (500 MHz, CDCl 3 ) δ 7.31 Br (d, J = 2.8 Hz, 1H), 6.91 (dd, J = 10.1, 2.8 Hz, 1H), 6.54 (d, J = 10.1 Hz, 1H), CF 2 H 6.15 (tdd, J = 55.7, 5.9, 3.0 Hz, 1H), 3.55 (d, J = 10.7 Hz, 1H), 3.39 (d, J = 10.6 Hz, 1H), (m, 1H), (m, 1H), 1.43 (s, 9H), 1.25 (d, J = 1.7 Hz, 3H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (dd, J = 240.1, Hz), (s), (s), (dd, J = 7.1, 2.4 Hz), (s), (dd, J = 23.1, 22.2 Hz), (s), (d, J = 2.4 Hz). 19 F MR (282 MHz, CDCl 3 ) δ (m). HRMS (ESI) calcd for C 16 H 21 BrF (M+H + ): , found: tert-butyl-4-(2,2-difluoroethyl)-4,7,9-trimethyl-2-azaspiro[4.5]deca-6,9-diene-3,8-dione (2n) 13

14 Prepared according to general method and isolated in 93% yield after chromoatography as white solide (60.7 mg): 1 H MR (500 MHz, CDCl 3 ) δ CF 2 H 6.61 (s, 2H), 6.10 (t, J = 56.4 Hz, 1H), 3.49 (d, J = 10.2 Hz, 1H), 3.24 (d, J = 10.3 Hz, 1H), (m, 1H), 1.93 (s, 6H), 1.67 (d, J = 14.8 Hz, 1H), 1.40 (s, 9H), 1.19 (s, 3H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (dd, J = 239.7, Hz), (s), (s), (dd, J = 6.6, 2.8 Hz), (s), (t, J = 22.3 Hz), (s), (s), (s), (s). 19 F MR (282 MHz, CDCl 3 ) δ (AB, ddddd, J = , 56.7, 22.8, 15.9, 1.9 Hz Hz, 1F), (AB, ddt, J = , 56.1, 15.0 Hz, 1F). HRMS (ESI) calcd for C 18 H 26 F (M+H + ): , found: tert-butyl-4-(2,2-difluoroethyl)-7,9-dimethoxy-4-methyl-2-azaspiro[4.5]deca-6,9-diene-3,8- dione (2o) Prepared according to general method and isolated in 53% yield after Me chromoatography as yellow oil (37.9 mg): 1 H MR (500 MHz, CDCl 3 ) δ 6.10 (ddd, J = 56.1, 7.9, 3.9 Hz, 1H), 5.76 (s, 1H), 5.72 (s, 1H), 3.67 (s, 3H), CF 2 H 3.65 (s, 3H), 3.55 (d, J = 10.3 Hz, 1H), 3.31 (d, J = 10.3 Hz, 1H), 2.09 (ddd, Me J = 19.8, 17.3, 8.5 Hz, 1H), 1.67 (qd, J = 15.1, 5.6 Hz, 1H), 1.40 (d, J = 0.5 Hz, 10H), 1.20 (s, 3H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (dd, J = 239.6, Hz), (s), (s), (s), (s), (s), (s), (dd, J = 6.6, 2.9 Hz), (s), (t, J = 22.3 Hz), (s), (s). 19 F MR (282 MHz, CDCl 3 ) δ (AB, dddd, J = , 38.9, 23.0, 16.6 Hz, 1F), (AB, ddt, J = , 56.0, 14.8 Hz, 1F). HRMS (ESI) calcd for C 18 H 26 F (M+H + ): , found: '-tert-butyl-4'-(2,2-difluoroethyl)-4'-methyl-4H-spiro[naphthalene-1,3'-pyrrolidine]-4,5'-dione (2p) Prepared according to general method and isolated in 78% yield after chromoatography as yellow oil (54.3 mg): 1 H MR (500 MHz, CDCl 3 ) δ 8.22 CF 2 H (d, J = 7.8 Hz, 1H), 7.64 (d, J = 8.1 Hz, 1H), 7.57 (t, J = 7.7 Hz, 1H), 7.49 (t, J = 7.5 Hz, 1H), 7.02 (d, J = 10.4 Hz, 1H), 6.62 (d, J = 10.4 Hz, 1H), 6.00 (tdd, J = 56.3, 5.9, 2.8 Hz, 1H), 3.85 (d, J = 10.6 Hz, 1H), 3.72 (d, J = 10.6 Hz, 1H), (m, 1H), (m, 9H), 1.42 (dd, J = 15.6, 9.5 Hz, 1H), 1.37 (d, J = 8.6 Hz, 3H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (dd, J = 239.7, Hz), (s), (s), (dd, J = 7.5, 2.2 Hz), (s), 14

15 37.84 (dd, J = 23.1, 21.7 Hz), (s), (d, J = 2.4 Hz). 19 F MR (282 MHz, CDCl 3 ) δ (m). HRMS (ESI) calcd for C 20 H 24 F (M+H + ): , found: tert-butyl-4-(2,2-difluoroethyl)-2-azaspiro[4.5]deca-6,9-diene-3,8-dione (2q) Prepared according to general method and isolated in 82% yield after chromoatography as yellow oil (46.5 mg): 1 H MR (500 MHz, CDCl 3 ) δ 6.84 CF 2 H (dd, J = 10.2, 2.9 Hz, 1H), 6.80 (dd, J = 10.1, 2.9 Hz, 1H), 6.40 (s, 1H), 6.38 (s, 1H), 6.10 (tdd, J = 57.1, 6.3, 3.3 Hz, 1H), 3.58 (d, J = 10.2 Hz, 1H), 3.29 (d, J = 10.2 Hz, 1H), 2.83 (dd, J = 7.8, 5.8 Hz, 1H), (m, 1H), (m, 1H), 1.40 (s, 9H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (t, J = Hz), (s), (s), (dd, J = 7.1, 3.6 Hz), (s), (dd, J = 23.4, 22.1 Hz), (s). 19 F MR (282 MHz, CDCl 3 ) δ (AB, dddd, J = 283.1, 56.7, 14.7, 11.1 Hz, 1F), (AB, ddt, J = 283.1, 57.5, 26.4, 14.3 Hz, 1F). HRMS (ESI) calcd for C 15 H 20 F (M+H + ): , found: ethyl 3-(2-tert-butyl-4-methyl-3,8-dioxo-2-azaspiro[4.5]deca-6,9-dien-4-yl)-2,2-difluoropropanoate (3b) Prepared according to general method and isolated in 72% yield after chromoatography as yellow oil (53.2 mg): 1 H MR (500 MHz, CDCl 3 ) δ (m, 2H), 6.43 (dd, J = 8.4, 3.8 Hz, 1H), (m, 1H), CF 2 C 2 Et 4.26 (q, J = 7.1 Hz, 2H), 3.55 (d, J = 10.4 Hz, 1H), 3.20 (d, J = 10.4 Hz, 1H), 2.63 (ddd, J = 24.6, 17.3, 16.1 Hz, 1H), 2.06 (ddd, J = 24.7, 15.9, 8.8 Hz, 1H), 1.40 (s, 9H), 1.35 (d, J = 2.2 Hz, 3H), 1.31 (t, J = 7.1 Hz, 3H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (t, J = 32.5 Hz), (s), (d, J = 1.0 Hz), (d, J = 1.9 Hz), (s), (dd, J = 255.3, Hz), (s), (s), (s), (s), (s), (dd, J = 24.3, 21.7 Hz), (s), (d, J = 4.8 Hz), (s). 19 F MR (282 MHz, CDCl 3 ) δ (AB, ddd, J = 264.2, 24.3, 9.0 Hz, 1F), (AB, ddd, J = 264.2, 23.9, 18.3 Hz, 1F). HRMS (ESI) calcd for C 19 H 26 F (M+H + ): , found: tert-butyl-4-methyl-4-(2,2,2-trifluoroethyl)-2-azaspiro[4.5]deca-6,9-diene-3,8-dione (4b) 15

16 Prepared according to general method and isolated in 88% yield after chromoatography as yellow oil (55.6 mg): 1 H MR (500 MHz, CDCl 3 ) δ 6.89 CF 3 (dd, J = 10.2, 3.1 Hz, 1H), 6.85 (dd, J = 10.2, 3.1 Hz, 1H), 6.41 (dd, J = 10.3, 1.5 Hz, 1H), (m, 1H), 3.57 (d, J = 10.5 Hz, 1H), 3.18 (d, J = 10.5 Hz, 1H), 2.65 (dq, J = 15.9, 12.3 Hz, 1H), 2.14 (dq, J = 15.8, 11.3 Hz, 1H), 1.40 (s, 9H), 1.33 (s, 3H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (q, J = Hz), (s), (s), (s), (s), (q, J = 29.3 Hz), (s), (d, J = 1.6 Hz). 19 F MR (282 MHz, CDCl 3 ) δ (t, J = 11.8 Hz). HRMS (ESI) calcd for C 16 H 21 F (M+H + ): , found: CF 2 CF 2 CF 2 CF 3 Prepared according to general method and isolated in 85% yield after chromoatography as yellow oil (79.2 mg): 1 H MR (500 MHz, CDCl 3 ) δ 6.92 (d, J = 10.3 Hz, 1H), 6.86 (d, J = 10.3 Hz, 1H), 6.43 (d, J = 10.4 Hz, 1H), 6.36 (d, J = 10.4 Hz, 1H), 3.60 (d, J = 10.4 Hz, 1H), 3.18 (d, J = 10.5 Hz, 1H), (m, 1H), 2.16 (dd, J = 36.8, 16.4 Hz, 1H), 1.41 (s, 12H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (d, J = 2.5 Hz), (d, J = 3.8 Hz), (s), (m), (s), (s), (s), (s), (t, J = 21.0 Hz), (s), (d, J = 5.2 Hz). 19 F MR (282 MHz, CDCl 3 ) δ (ddd, J = 12.6, 6.3, 3.0 Hz, 3F), (d, J = Hz, 1F), (m, 1F), (m, 2F), (ddd, J = 27.1, 16.2, 8.0 Hz, 2F). HRMS (ESI) calcd for C 19 H 21 F (M+H + ): , found: S 2 CH 2 F 2-tert-butyl-4-methyl-4-(2,2,3,3,4,4,5,5,5-nonafluoropentyl)-2- azaspiro[4.5]deca-6,9-diene-3,8-dione (5b) 2-tert-butyl-4-((fluoromethylsulfonyl)methyl)-4-methyl-2- azaspiro[4.5]deca-6,9-diene-3,8-dione (6a) Prepared according to general method and isolated in 78% yield after chromoatography as yellow oil (53.6 mg): 1 H MR (500 MHz, CDCl 3 ) δ (m, 2H), 6.45 (dd, J = 10.4, 1.6 Hz, 1H), 6.40 (dd, J = 10.4, 1.6 Hz, 1H), 5.17 (dd, J = 47.0, 10.3 Hz, 1H), 5.00 (dd, J = 46.8, 10.3 Hz, 1H), 3.59 (d, J = 10.6 Hz, 1H), 3.49 (d, J = 15.0 Hz, 1H), 3.27 (d, J = 10.6 Hz, 1H), 3.00 (d, J = 15.0 Hz, 1H), 1.52 (s, 3H), 1.39 (s, 9H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (d, J = Hz), (s), (s), (s), (s), (s), (s), (s). 19 F MR (282 MHz, 16

17 CDCl 3 ) δ (t, J = 46.9 Hz). HRMS (ESI) calcd for C 16 H 23 F 4 S + (M+H + ): , found: Prepared according to general method and isolated in 81% yield after S 2 CH 2 CF 3 chromoatography as yellow oil (63.8 mg): 1 H MR (500 MHz, CDCl 3 ) δ (m, 2H), 6.44 (dd, J = 8.6, 3.3 Hz, 1H), 6.39 (dd, J = 8.5, 3.2 Hz, 1H), (m, 1H), 3.88 (dq, J = 15.6, 9.3 Hz, 1H), 3.58 (dd, J = 16.4, 12.8 Hz, 2H), 3.26 (d, J = 10.6 Hz, 1H), 3.05 (d, J = 15.0 Hz, 1H), 1.53 (s, 3H), 1.39 (s, 9H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (q, J = Hz), (d, J = 2.1 Hz), (q, J = 31.4 Hz), (s), (s), (s), (s), (s), (s). 19 F MR (282 MHz, CDCl 3 ) δ (t, J = 9.3 Hz). HRMS (ESI) calcd for C 17 H 23 F 3 4 S + (M+H + ): , found: tert-butyl-4-methyl-4-((2,2,2-trifluoroethylsulfonyl)methyl)-2-azaspiro[4.5]deca-6,9-diene-3,8- dione (7a) 2-cyclohexyl-4-((fluoromethylsulfonyl)methyl)-4-methyl-2- azaspiro[4.5]deca-6,9-diene-3,8-dione (6f) Prepared according to general method and isolated in 52% yield after chromoatography as yellow oil (38.4 mg): 1 H MR (500 MHz, CDCl 3 ) δ 6.88 (ddd, J = 19.7, 10.3, 2.9 Hz, 2H), 6.43 (ddd, J = 31.6, 10.1, 0.8 Hz, S 2 CH 2 F 2H), 5.22 (dt, J = 19.6, 9.8 Hz, 1H), (m, 1H), 3.95 (td, J = 11.5, 3.6 Hz, 1H), 3.51 (dd, J = 12.8, 6.1 Hz, 2H), 3.21 (d, J = 10.6 Hz, 1H), (m, 1H), (m, 6H), 1.54 (s, 3H), (m, 4H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (d, J = Hz), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s). 19 F MR (282 MHz, CDCl 3 ) δ (t, J = 46.9 Hz). HRMS (ESI) calcd for C 18 H 25 F 4 S + (M+H + ): , found: cyclohexyl-4-methyl-4-((2,2,2-trifluoroethylsulfonyl)methyl)-2-azaspiro[4.5]deca-6,9-diene-3,8-dione (7f) Prepared according to general method and isolated in 51% yield after chromoatography as yellow oil (42.8 mg): 1 H MR (500 MHz, CDCl 3 ) δ 6.87 (dd, J = 23.4, 10.4 Hz, 2H), 6.46 (dd, J = 33.6, 10.4 Hz, 2H), S 2 CH 2 CF 3 17

18 4.26 (dq, J = 17.8, 8.9 Hz, 1H), (m, 2H), 3.59 (d, J = 15.2 Hz, 1H), 3.53 (d, J = 10.7 Hz, 1H), 3.22 (d, J = 10.4 Hz, 1H), 3.04 (d, J = 15.2 Hz, 1H), 1.83 (s, 2H), (m, 3H), 1.57 (s, 3H), (m, 4H), 1.08 (d, J = 12.7 Hz, 1H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (q, J = Hz), (s), (dd, J = 62.8, 31.2 Hz), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s). 19 F MR (282 MHz, CDCl 3 ) δ (t, J = 9.2 Hz). HRMS (ESI) calcd for C 19 H 25 F 3 4 S + (M+H + ): , found: tert-butyl-4-((fluoromethylsulfonyl)methyl)-7-methoxy-4-methyl-2-azaspiro[4.5]deca-6,9-diene-3,8- dione (6j) Prepared according to general method and isolated in 80% yield after chromoatography as yellow oil (59.8 mg): 1 H MR (500 MHz, CDCl 3 ) Me δ 6.89 (dd, J = 2.7, 1.6 Hz, 1H (isomer A)), 6.87 (dd, J = 2.7, 1.6 Hz, S 2 CH 2 F 1H (isomer B)), 6.46 (d, J = 10.2 Hz, 1H (isomer A)), 6.42 (d, J = 10.1 Hz, 1H (isomer B)), 5.75 (dd, J = 63.6, 2.7 Hz, 2H (both isomer)), (m, 4H (both isomer)), 3.71 (s, 3H (isomer A)), 3.67 (s, 3H (isomer B)), 3.61 (d, J = 10.5 Hz, 2H (both isomer)), 3.45 (t, J = 15.7 Hz, 2H (both isomer)), 3.35 (d, J = 10.4 Hz, 1H (isomer A)), 3.26 (d, J = 10.5 Hz, 1H (isomer B)), 3.13 (d, J = 15.0 Hz, 1H (isomer A)), 2.91 (d, J = 15.0 Hz, 1H (isomer B)), 1.57 (s, 3H (isomer A)), 1.47 (s, 3H (isomer B)), 1.41 (s, 9H (isomer A)), 1.40 (s, 9H (isomer B)). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (d, J = Hz), (d, J = Hz), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (s). 19 F MR (282 MHz, CDCl 3 ) δ (t, J = 46.8 Hz (isomer A)), (t, J = 46.9 Hz (isomer B)). HRMS (ESI) calcd for C 17 H 25 F 5 S + (M+H + ): , found: tert-butyl-7-methoxy-4-methyl-4-((2,2,2-trifluoroethylsulfonyl)methyl)-2-azaspiro[4.5]deca-6,9-diene- 3,8-dione (7j) Prepared according to general method and isolated in 85% yield after chromoatography as yellow oil (72.0 mg): 1 H MR (500 MHz, Me CDCl 3 ) δ 6.88 (t, J = 3.2 Hz, 1H (isomers A)), 6.86 (t, J = 3.2 Hz, S 2 CH 2 CF 3 1H (isomers B)), 6.44 (d, J = 10.2 Hz, 1H (isomers A)), 6.40 (d, J = 10.1 Hz, 1H (isomers B)), 5.79 (d, J = 2.6 Hz, 1H (isomers A)), 5.67 (d, J = 2.6 Hz, 1H (isomers B)), (m, 2H (isomers A)), 3.91 (ddd, J = 18.4, 15.7, 9.3 Hz, 2H (isomers B)), 3.69 (s, 3H (isomers A)), 3.65 (s, 3H (isomers B)), 3.63 (d, J = 4.9 Hz, 1H (isomers A)),

19 (d, J = 5.0 Hz, 1H (isomers B)), 3.53 (d, J = 15.1 Hz, 1H (both isomers)), 3.34 (d, J = 10.5 Hz, 1H (isomers A)), 3.25 (d, J = 10.6 Hz, 1H (isomers B)), 3.16 (d, J = 15.1 Hz, 1H (isomers A)), 2.97 (d, J = 15.0 Hz, 1H (isomers B)), 1.57 (s, 3H (isomers A)), 1.48 (s, 3H (isomers B)), 1.40 (s, 9H (isomers A)), 1.39 (s, 9H (isomers B)). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (s), (s), (s), (s), (q, J = Hz), δ (q, J = Hz), (s), (d, J = 2.4 Hz), (s), (q, J = 31.3 Hz), δ (q, J = 31.4 Hz), (d, J = 6.0 Hz), (d, J = 3.8 Hz), (s), (s), (s), (s), (s), (d, J = 2.6 Hz), (s), (s). 19 F MR (282 MHz, CDCl 3 ) δ (t, J = 9.2 Hz), (m). HRMS (ESI) calcd for C 18 H 25 F 3 5 S + (M+H + ): , found: tert-butyl-7-fluoro-4-((fluoromethylsulfonyl)methyl)-4-methyl-2-azaspiro[4.5]deca-6,9-diene-3,8-dione (6k) Prepared according to general method and isolated in 70% yield after chromoatography as yellow oil (50.7 mg): 1 H MR (500 MHz, CDCl 3 ) δ F 6.93 (ddd, J = 9.9, 5.8, 2.7 Hz, 1H (both isomer)), 6.50 (dd, J = 10.2, 7.0 S 2 CH 2 F Hz, 1H (isomer A)), 6.45 (dd, J = 9.7, 2.9 Hz, 1H (both isomer)), 6.42 (dd, J = 6.5, 3.3 Hz, 1H (isomer B)), 5.15 (dd, J = 12.7, 10.5 Hz, 1H (isomer A)), 5.05 (dt, J = 10.4, 8.0 Hz, 1H (both isomer)), 4.95 (dd, J = 10.4, 5.6 Hz, 1H (isomer B)), (m, 1H(both isomer)), (m, 1H(both isomer)), 3.33 (dd, J = 17.6, 10.6 Hz, 1H (both isomer)), 3.05 (dd, J = 23.4, 14.9 Hz, 1H (both isomer)), 1.55 (t, J = 4.8 Hz, 3H (both isomer)), 1.41 (d, J = 1.0 Hz, 9H (both isomer)). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (d, J = 52.5 Hz), (d, J = 53.3 Hz), (d, J = 2.2 Hz), (d, J = 2.1 Hz), (d, J = 4.5 Hz), (d, J = 4.5 Hz), (d, J = 14.4 Hz), (d, J = 15.8 Hz), (d, J = Hz), (d, J = Hz), (s), (s), (s), (s), (d, J = 1.6 Hz), (d, J = 1.5 Hz), (d, J = 2.5 Hz), (d, J = 3.2 Hz), (d, J = 5.4 Hz), (d, J = 6.0 Hz), (s), (s), (s). 19 F MR (282 MHz, CDCl 3 ) δ (dd, J = 13.0, 6.9 Hz, 1F (isomer A)), (dd, J = 12.1, 7.0 Hz, 1F (isomer B)), (t, J = 47.0 Hz, 2F (isomer A), (t, J = 47.0 Hz, 2F (isomer B)). HRMS (ESI) calcd for C 16 H 22 F 2 4 S + (M+H + ): , found: tert-butyl-7-fluoro-4-methyl-4-((2,2,2-trifluoroethylsulfonyl)methyl)-2-azaspiro[4.5]deca-6,9-diene-3,8- dione (7k) Prepared according to general method and isolated in 76% yield after chromoatography as yellow oil (62.6 mg): 1 H MR (500 MHz, CDCl 3 ) F S 2 CH 2 CF 3 δ 6.91 (ddd, J = 9.7, 6.8, 2.8 Hz, 1H (both isomers)), (m, 2H (both isomers)), (m, 1H (isomer A)), 3.85 (dq, J = 18.5,

20 Hz, 1H (isomer B), (m, 2H (both isomers)), 3.32 (dd, J = 14.2, 10.7 Hz, 1H(both isomers)), 3.12 (dd, J = 33.4, 14.9 Hz, 1H(both isomers)), 1.55 (d, J = 2.3 Hz, 3H(both isomers)), 1.40 (d, J = 0.7 Hz, 9H (both isomers)). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (d, J = 55.7 Hz), (d, J = 56.5 Hz), (s), (s), (s), (d, J = 4.2 Hz), δ (d, J = Hz), (d, J = Hz), (q, J = Hz), (s), (q, J = 31.6 Hz), (q, J = 31.8 Hz), (s), (s), (s), (s), (d, J = 1.7 Hz), (d, J = 2.7 Hz), (d, J = 5.2 Hz), (d, J = 6.0 Hz), (s), (d, J = 11.5 Hz). 19 F MR (282 MHz, CDCl 3 ) δ (t, J = 9.3 Hz, 2F (isomer A)), (t, J = 9.2 Hz, 2F (isomer B)), (dd, J = 13.0, 6.9 Hz, 1F (isomer A)), (dd, J = 12.8, 6.9 Hz, 2F (isomer B)). HRMS (ESI) calcd for C 17 H 22 F 4 4 S + (M+H + ): , found: tert-butyl-4-((fluoromethylsulfonyl)methyl)-2-azaspiro[4.5]deca-6,9-diene-3,8-dione (6q) Prepared according to general method and isolated in 82% yield after chromoatography as yellow oil (54.1 mg): 1 H MR (500 MHz, CDCl 3 ) δ S 2 CH 2 F 6.86 (dd, J = 9.9, 2.9 Hz, 1H), 6.77 (dd, J = 10.1, 3.0 Hz, 1H), 6.45 (td, J = 11.9, 1.8 Hz, 2H), 5.56 (dd, J = 46.6, 10.1 Hz, 1H), (m, 1H), 3.67 (d, J = 10.3 Hz, 1H), 3.54 (dd, J = 15.4, 7.4 Hz, 1H), 3.38 (dd, J = 7.4, 4.0 Hz, 1H), 3.34 (d, J = 10.3 Hz, 1H), 2.50 (dd, J = 15.2, 3.4 Hz, 1H), 1.41 (s, 9H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (d, J = Hz), (s), (s), (s), (s), (s), (s). 19 F MR (282 MHz, CDCl 3 ) δ (t, J = 46.6 Hz). HRMS (ESI) calcd for C 15 H 21 F 4 S + (M+H + ): , found: tert-butyl-4-((2,2,2-trifluoroethylsulfonyl)methyl)-2-azaspiro[4.5]deca-6,9-diene-3,8-dione (7q) Prepared according to general method and isolated in 83% yield after chromoatography as yellow oil (63.0 mg): 1 H MR (500 MHz, CDCl 3 ) δ S 2 CH 2 CF (dd, J = 10.0, 3.1 Hz, 1H), 6.78 (dd, J = 10.1, 3.1 Hz, 1H), 6.49 (dd, J = 10.0, 1.8 Hz, 1H), 6.46 (dd, J = 10.1, 1.8 Hz, 1H), 4.63 (dq, J = 18.3, 9.1 Hz, 1H), (m, 1H), 3.69 (d, J = 10.3 Hz, 1H), 3.55 (dd, J = 15.3, 8.2 Hz, 1H), 3.43 (dd, J = 8.2, 3.1 Hz, 1H), 3.37 (d, J = 10.3 Hz, 1H), 2.55 (dd, J = 15.3, 2.2 Hz, 1H), 1.44 (s, 9H). 13 C MR (126 MHz, CDCl 3 ) δ (s), (s), (s), (s), (s), (s), (q, J = Hz), (q, J = 31.6 Hz), (s), (s), (s), (s), (s), (s). 19 F MR (282 MHz, CDCl 3 ) δ (t, J = 9.2 Hz). HRMS (ESI) calcd for C 16 H 21 F 3 4 S + (M+H + ): , found:

21 IV. References 1. Han, G.; Liu, Y.; Wang, Q. rg. Lett. 2014, 16, Tang, X.J.; Thomoson, C.S.; Dolbier, W. R. Jr. rg. Lett. 2014, 16,

22 V. MR Spectra for new compounds 22

23 Me 1a 23

24 Me 1a 24

25 Bn 1b 25

26 Bn 1b 26

27 PMB 1c 27

28 PMB 1c 28

29 Bn 1d 29

30 Bn 1d 30

31 Bn 1e 31

32 Bn 1e 32

33 Bn 1f 33

34 Bn 1f 34

35 Bn 1g 35

36 Bn 1g 36

37 Bn Bn 1h 37

38 Bn Bn 1h 38

39 Bn 1i 39

40 Bn 1i 40

41 Me Bn 1j 41

42 Me Bn 1j 42

43 F Bn 1k 43

44 F Bn 1k 44

45 F Bn 1k 45

46 46

47 Cl Bn 1l 47

48 Cl Bn 1l 48

49 Br Bn 1m 49

50 Br Bn 1m 50

51 tbu Bn 1n 51

52 tbu Bn 1n 52

53 Me Bn Me 1o 53

54 Me Bn Me 1o 54

55 tbu Bn 1p 55

56 tbu Bn 1p 56

57 Bn 1q 57

58 Bn 1q 58

59 CF 2 H 2a 59

60 CF 2 H 2a 60

61 CF 2 H 2a 61

62 2d CF 2 H 62

63 2d CF 2 H 63

64 2d CF 2 H 64

65 2e CF 2 H 65

66 2e CF 2 H 66

67 2e CF 2 H 67

68 CF 2 H 2f 68

69 CF 2 H 2f 69

70 CF 2 H 2f 70

71 2g CF 2 H 71

72 2g CF 2 H 72

73 2g CF 2 H 73

74 Bn HF 2 C 2g' 74

75 Bn HF 2 C 2g' 75

76 Bn HF 2 C 2g' 76

77 2h CF 2 H 77

78 2h CF 2 H 78

79 2h CF 2 H 79

80 Me 2j CF 2 H 80

81 Me 2j CF 2 H 81

82 Me 2j CF 2 H 82

83 F 2k CF 2 H 83

84 F 2k CF 2 H 84

85 F 2k CF 2 H 85

86 Cl 2l CF 2 H 86

87 Cl 2l CF 2 H 87

88 Cl 2l CF 2 H 88

89 Br 2m CF 2 H 89

90 Br 2m CF 2 H 90

91 Br 2m CF 2 H 91

92 CF 2 H 2n 92

93 CF 2 H 2n 93

94 CF 2 H 2n 94

95 Me Me 2o CF 2 H 95

96 Me Me 2o CF 2 H 96

97 Me Me 2o CF 2 H 97

98 2p CF 2 H 98

99 2p CF 2 H 99

100 2p CF 2 H 100

101 2q CF 2 H 101

102 2q CF 2 H 102

103 2q CF 2 H 103

104 3 CF 2 CEt 104

105 3 CF 2 CEt 105

106 3 CF 2 CEt 106

107 4 CF 3 107

108 4 CF 3 108

109 4 CF 3 109

110 5 CF 2 CF 2 CF 2 CF 3 110

111 5 CF 2 CF 2 CF 2 CF 3 111

112 5 CF 2 CF 2 CF 2 CF 3 112

113 6a S 2 CH 2 F 113

114 6a S 2 CH 2 F 114

115 6a S 2 CH 2 F 115

116 7a S 2 CH 2 CF 3 116

117 7a S 2 CH 2 CF 3 117

118 7a S 2 CH 2 CF 3 118

119 6f S 2 CH 2 F 119

120 6f S 2 CH 2 F 120

121 6f S 2 CH 2 F 121

122 7f S 2 CH 2 CF 3 122

123 7f S 2 CH 2 CF 3 123

124 7f S 2 CH 2 CF 3 124

125 Me S 2 CH 2 F 6j 125

126 Me S 2 CH 2 F 6j 126

127 Me S 2 CH 2 F 6j 127

128 Me 7j S 2 CH 2 CF 3 128

129 Me 7j S 2 CH 2 CF 3 129

130 Me 7j S 2 CH 2 CF 3 130

131 F 6k S 2 CH 2 F 131

132 F 6k S 2 CH 2 F 132

133 F 6k S 2 CH 2 F 133

134 F 7k S 2 CH 2 CF 3 134

135 F 7k S 2 CH 2 CF 3 135

136 F 7k S 2 CH 2 CF 3 136

137 6q S 2 CH 2 F 137

138 6q S 2 CH 2 F 138

139 6q S 2 CH 2 F 139

140 7q S 2 CH 2 CF 3 140

141 7q S 2 CH 2 CF 3 141

142 7q S 2 CH 2 CF 3 142

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