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1 Supporting Information Ceric Ammonium Nitrate (CAN) catalyzed efficient one-pot three component aza-diels-alder reactions for a facile synthesis of tetrahydropyranoquinoline derivatives Ravinder Goud Puligoundla a, Hanmanth Reddy Vulupala, Nagaiah Kommu a*, Sudhakar Babu Kondra b*. a Organic Chemistry Division-III, Indian Institute of Chemical Technology Hyderabad INDIA. Fax: ; Tel: ; nagaiah@iict.res.in b Department of Chemistry, Sri Krishnadevaraya University- Ananthapur, INDIA. Fax: ; Tel: ; mailto: drksbabu@gmail.com

2 4. Experimental 4.1 Materials and methods All the commercial reagents and solvents were used without further purification unless otherwise stated. Melting points were recorded on a Buchi 535 melting point apparatus and are uncorrected. All the reactions were monitored by thin layer chromatography performed on precoated silica gel 60F 254 plates (Merck). Compounds were visualized with UV light at 254 nm and 365 nm, I 2 and heating plates after dipping in 2% phosphomolybdic acid in 15% aq. H 2 SO 4 soln. IR spectra were recorded on a Perkin-Elmer 683 or a 1310 FT-IR spectrometers with KBr pellets. NMR spectra were recorded on a Varian Unity-400 MHz and BRUKER AMX 300 spectrometers using TMS as an internal standard. 13 C NMR was recorded on a Varian Unity 100 MHz using CDCl 3 as internal standard. Mass spectra were recorded on a VG Micromass 7070H and a Finnigan Mat 1020B mass spectrometers operating at 70eV. Typical experimental procedure for the preparation of compounds tetrahyroquinolines: Benzaldehye (1.1 mmol), Aniline ( 1.1 mmol), 3,4-dihydro-2H-pyran (1.3 mmol) and in acetonitrile (5 ml) were mixed in a flask and CAN (10 mol %) was added at room temperature. The resulting mixture was stirred at room temperature for 30 min and completion of the reaction was monitored by TLC (ethylacetate : hexane 4:6). The reaction mixture was extracted into CH 3 Cl and dried over Na 2 SO 4 and solvent was evaporated and the crude residue obtained was purified by column chromatography [silica gel, ethyl acetate-hexane 10:90] to give pure tetrahydropyranoquinolines 4 and 5 in 97 % yield. 2

3 5-Phenyl-3,4,4a,5,6,10b-hexahydro-2H-pyrano[3,2-c]quinoline (4&5 a) [Cis isomer]:pale Yellow Solid;m.p o C. IR (KBr): ν max 3311, 3020, 2923, 2857, 1605, 1493, 1066, 752 cm H NMR (300 MHz, CDCl 3 ), : (m, 4H), (m, 1H), 3.40 (d, J = 2.4, 11.3 Hz, 1H), 3.55 (dd, J = 2.4, 11.3 Hz, 1H), 3.80 (s, 1H), 4.70 (d, J = 2.7 Hz, 1H), 5.30 (d, J = 5.5 Hz, 1H), 6.55 (d, J = 8.0 Hz, 1H), 6.78 (t, J = 8.0 Hz, 1H), 7.05 (t, J = 7.8 Hz, 1H), (m, 6H).;MS (ESI): m/z = 265 ([M+H]) +. 5-Phenyl-3,4,4a,5,6,10b-hexahydro-2H-pyrano[3,2-c]quinoline [Trans isomer]: viscous oil; IR (KBr): ν max 3378, 3061, 2945, 2857, 1612, 1499, 1366, 708 cm -1.; MS (ESI): m/z = 265 ([M+H]) +. 1 H NMR (300 MHz, CDCl 3 ), 1.27 (m, 1H), 1.58 (m, 1H), 1.69 (m, 1H), 1.85 (m, 1H), 3.76 (dt, J = 2.5, 11.6 Hz, 1H), 4.11 (m, 2H), 4.35 (d, J = 3.1 Hz, 1H), 4.72 (d, J = 10.9 Hz, 1H), 6.59 (d, J = 7.4 Hz, 1H), 6.73 (t, J = 7.2 Hz, 1H), 7.11 (t, J = 7.2 Hz, 1H), 7.27 (d, J = 7.4 Hz, 1H), (m, 5H). 5-(3-Methoxy-phenyl)-3,4,4a,5,6,10b-hexahydro-2H-pyrano[3,2-c]quinoline (4&5b): Cis isomer : Thick syrup; Rf (20% EtOAc/n-hexane) 0.5.; IR (KBr) (ν max, cm -1 ): 3374 (N-H), 3040, 2923, 2855, 1515, 1345, 1068, 759; 1 H NMR (300 MHz,CDCl 3 ), : (m, 4H), (m, 1H); 3.67 (m, 1H), 3.81 (s, 3H), 4.64 (d, J = 2.2 Hz, 1H), 5.27 (d, J = 5.2 Hz, 1H), 6.54 (d, J = 8.3 Hz, 1H), 6.78 (t, J = 11.3 Hz, 1H), 7.04 (t, J = 7.5 Hz, 3H), 7.24 (d, J = 7.5 Hz, 1H), 7.37 (d, 1H); MS (ESI) m/z 296 ([M+H]) +. Anal. Calcd. for C 19 H 21 NO 2 : C, 77.26; H, 7.17; N, 4.74; O, Found: C, 77.23; H, 7.17; N, Trans isomer : Mp o C; Rf (20% EtOAc/n-hexane) 0.48.; IR (KBr) (ν max, cm -1 ): 3374 (N-H), 3040, 2923, 2855, 1515, 1345, 1068, 759; 1 H NMR (300 MHz, CDCl 3 ), :

4 1.55 (m, 4H), (m, 1H), 3.69 (dt, J = 3.0, 9.8 Hz, 1H), 3.79 (s, 3H), 4.09 (dd, J = 3.7, 11.3 Hz, 1H), 4.34 (d, J = 2.2 Hz, 1H), 4.67 (d, J = 10.5 Hz, 1H), 6.48 (d, J = 7.5 Hz, 1H), 6.65 (t, J = 8.3 Hz, 1H), 6.81 (dd, J = 3.7, 8.3 Hz, 1H), 6.94 (d, J = 8.3 Hz, 2H), 7.04 (dt, J = 1.51, 7.5 Hz, 1H), 7.16 (dd, J = 1.5, 7.5 Hz, 1H), 7.24 (dd, J = 1.5, 7.5 Hz, 1H); MS (ESI) m/z 296 ([M+H]) +. Anal. Calcd. for C 19 H 21 NO 2 : C, 77.26; H, 7.17; N, 4.74; O, Found: C, 77.25; H, 7.18; N, (2,4-Dichloro-phenyl)-3,4,4a,5,6,10b-hexahydro-2H-pyrano[3,2-c]quinoline (4& 5e): Cis isomer; Mp o C; Rf (20% EtOAc/n-hexane) 0.5.; IR (KBr) (ν max, cm -1 ): 3374 (N-H), 3040, 2923, 2855, 1515, 1345, 1068, 759; 1 H NMR (300 MHz, CDCl 3 ), : (m, 4H), (m, 1H), 3.42 (dt, J = 3.0, 11.3 Hz, 1H), 3.58 (dd, J = 3.7, 11.3 Hz, 1H), 5.01 (d, J = 2.2 Hz, 1H), 5.26 (d, J = 5.2 Hz, 1H), 6.55 (d, J = 6.8 Hz, 1H), 6.77 (t, J = 7.5 Hz, 1H), 7.03 (t, J = 7.5 Hz, 1H), 7.27 (d, J = 8.3 Hz, 1H), 7.64 (m, 2H), 7.62 (d, J = 8.3 Hz, 2H); MS (ESI) m/z 334 ([M+H]) +. Anal. Calcd. for C 18 H 17 Cl 2 NO: C, 64.68; H, 5.13; Cl, 21.21; N, 4.19; O, Found: C, 64.66; H, 5.14; N, Trans isomer : Thick syrup; Rf (20% EtOAc/n-hexane) 0.45.; IR (KBr) (ν max, cm -1 ): 3374 (N-H), 3040, 2923, 2855, 1515, 1345, 1068, 759; 1 H NMR (300 MHz, CDCl 3 ), : (m, 4H), (m, 1H), 3.63 (dt, J = 3.0, 11.3 Hz, 1H), 3.92 (dd, J = 3.7, 11.3 Hz, 1H), 4.37 (d, J = 3.7 Hz, 1H), 5.09 (d, J = 8.3 Hz, 1H), 6.49 (d, J = 6.8 Hz, 1H), 6.69 (t, J = 7.5 Hz, 1H), 7.05 (t, J = 8.3 Hz, 1H), 7.24 (m, 3H), (m, 2H); MS (ESI) m/z 334 ([M+H]) +. Anal. Calcd. for C 18 H 17 Cl 2 NO: C, 64.68; H, 5.13; Cl, 21.21; N, 4.19; O, Found: C, 64.68; H, 5.12; N, (4-chloro-phenyl)-3,4,4a,5,6,10b-hexahydro-2H-pyrano[3,2-c]quinoline (4 & 5d): Cis isomer; Mp o C; Rf (20% EtOAc/n-hexane) 0.5.; IR (KBr) (ν max, cm -1 ): 3374 (N-H), 3040, 2923, 4

5 2855, 1515, 1345, 1068, 759; 1 H NMR (300 MHz, CDCl 3 ), : (m, 4H), (m, 1H), 3.42 (dt, J = 3.0, 11.3 Hz, 1H), 3.58 (dd, J = 3.7, 11.3 Hz, 1H), 5.01 (d, J = 2.2 Hz, 1H), 5.26 (d, J = 5.2 Hz, 1H), 6.55 (d, J = 6.8 Hz, 1H), 6.77 (t, J = 7.5 Hz, 1H), 7.03 (t, J = 7.5 Hz, 1H), 7.27 (d, J = 8.3 Hz, 1H), 7.64 (m, 2H), 7.62 (d, J = 8.3 Hz, 2H); MS (ESI) m/z 300 ([M+H]) +. HRMS: calcd for C 18 H 18 ON: Found Trans isomer : Thick syrup; Rf (20% EtOAc/n-hexane) 0.45.; IR (KBr) (ν max, cm -1 ): 3374 (N-H), 3040, 2923, 2855, 1515, 1345, 1068, 759; 1 H NMR (300 MHz, CDCl 3 ), : (m, 4H), (m, 1H), 3.63 (dt, J = 3.0, 11.3 Hz, 1H), 3.92 (dd, J = 3.7, 11.3 Hz, 1H), 4.37 (d, J = 3.7 Hz, 1H), 5.09 (d, J = 8.3 Hz, 1H), 6.49 (d, J = 6.8 Hz, 1H), 6.69 (t, J = 7.5 Hz, 1H), 7.05 (t, J = 8.3 Hz, 1H), 7.24 (m, 3H), (m, 2H); MS (ESI) m/z 300 ([M+H]) +. HRMS: calcd for C 18 H 18 ON: Found (4-Nitro-phenyl)-3,4,4a,5,6,10b-hexahydro-2H-pyrano[3,2-c]quinoline (4 & 5q): Cis isomer;. Mp o C; Rf (20% EtOAc/n-hexane) 0.5.; IR (KBr) (ν max, cm -1 ): 3374 (N-H), 3040, 2923, 2855, 1515, 1345, 1068, 759 ; 1 H NMR (300 MHz, CDCl 3 ), : (m, 4H), (m, 1H), 3.41 (dt, J = 2.9, 9.5 Hz, 1H), 3.61 (dd, J = 3.2, 11.9 Hz, 1H), 3.81 (s, 1H), 4.68 (d, J = 2.2 Hz, 1H), 5.31 (d, J = 5.8 Hz, 1H), 6.61 (d, J = 8.1 Hz, 1H), 6.81 (t, J = 7.3 Hz, 1H), 7.07 (t, J = 7.3 Hz, 1H), 7.42 (d, J = 8.1 Hz, 1H), 7.64 (d, J = 8.8 Hz, 2H), 8.26 (d, J = 8.8 Hz, 2H); MS (ESI) m/z 311 ([M+H]) +. Anal. Calcd. for C 18 H 18 N 2 O 3 : C, 69.66; H, 5.85; N, 9.03; O, Found: C, 69.64; H, 5.84; N, Trans isomer : Mp o C; Rf (20% EtOAc/n-hexane) 0.45.; IR (KBr) (ν max, cm -1 ): 3377 (N-H), 3070, 2929, 2852, 1517, 1344, 1080, 750; 1 H NMR (300 MHz, CDCl 3 ), : (m, 5

6 4H), (m, 1H), 3.44 (dt, J = 2.9, 9.5 Hz, 1H), 3.77 (dd, J = 3.2, 1.9 Hz, 1H), 4.04 (s, 1H), 4.39 (d, J = 2.9 Hz, 1H), 4.85 (d, J = 10.2 Hz, 1H), 6.56 (d, J = 7.3 Hz, 1H), 6.74 (t, J = 7.3 Hz, 1H), 7.11 (t, J = 7.3 Hz, 1H), 7.23 (d, J = 8.8 Hz, 1H), 7.64 (d, J = 8.8 Hz, 2H), 8.26 (d, J = 8.8 Hz, 2H); MS (ESI) m/z 311 ([M+H]) +. Anal. Calcd. for C 18 H 18 N 2 O 3 : C, 69.66; H, 5.85; N, 9.03; O, Found: C, 69.66; H, 5.84; N, (4-Bromo-phenyl)-9-isopropyl-3,4,4a,5,6,10b-hexahydro-2H-pyrano[3,2-]quinoline (4 & 5i): Cis isomer :Mp o C; Rf (20% EtOAc/n-hexane) 0.5.; IR (KBr) (ν max, cm -1 ): 3368 (N- H), 2936, 2860, 1493, 1067, 818; 1 H NMR (300 MHz, CDCl 3 ), : 1.21 (s, 3H), 1.25 (s, 3H), (m, 2H), (m, 1H), (m, 1H), 3.32 (dt, J = 2.9, 10.9 Hz, 2H), 3.52 (dd, J = 3.6, 10.9 Hz, 2H), 4.92 (d, J = 2.18 Hz, 1H), 5.22 (d, J = 5.0 Hz, 1H), 6.45 (d, J = 8.0 Hz, 1H), 6.92 (dd, J = 2.1, 8.0 Hz, 1H), (m, 3H), 7.40 (d, J = 8.7 Hz, 2H), 7.69 (d, J = 8.7 Hz, 1H); MS (ESI) m/z 386 ([M+H]) +. Anal. Calcd. for C 21 H 24 BrNO: C, 65.29; H, 6.26; Br, 20.68; N, 3.63; O, Found: C, 65.26; H, 6.26; N, Trans isomer: Mp o C; Rf (20% EtOAc/n-hexane) 0.45.; IR (KBr) (ν max, cm -1 ): 3368 (N-H), 2936, 2860, 1493, 1067, 818; 1 H NMR (300 MHz, CDCl 3 ), : 1.94 (s, 3H), 1.23 (s, 3H), (m, 2H), (m, 1H), (m, 1H), 3.62 (dt, J = 2.1, Hz, 2H), 4.04 (dd, J = 2.1, 11.6 Hz, 2H), 4.30 (d, J = 2.1 Hz, 1H), 4.60 (d, J = 10.9 Hz, 1H), 6.45 (d, J = 8.0 Hz, 1H), 6.95 (dd, J = 2.1, 8.0 Hz, 1H), (d, J = 2.18, 2H), 7.28 (d, J = 8.01 Hz, 2H), 7.48 (d, J = 8.7 Hz, 1H); MS (ESI) m/z 386 ([M+H]) +. Anal. Calcd. for C 21 H 24 BrNO: C, 65.29; H, 6.26; Br, 20.68; N, 3.63; O, Found: C, 65.28; H, 6.27; N,

7 9-Fluoro-5-phenyl-3,4,4a,5,6,10b-hexahydro-2H-pyrano[3,2-c]quinoline (4 & 5l): Cis isomer : Mp o C; Rf (20% EtOAc/n-hexane) 0.5.; 1 H NMR (300 MHz, CDCl 3 ), : (m, 4H), 2.14 (m, 1H), 3.42 (dt, J = 3.02, 11.3Hz, 1H), 3.60 (dd, J = 3.02, 11.3 Hz, 1H), 3.70 (br s, 1H,), 4.63 (d, J = 3.0 Hz, 1H), 5.23 (d, J = 6.0 Hz 1H), (d, J = 4.5 Hz, 1H), 6.78 (dt, J = 3.0, 8.3 Hz, 1H), (dd, J = 3.0, 8.3 Hz, 1H), (m, 5H); MS (ESI) m/z 284 ([M+H]) +. Anal. Calcd. for C 18 H 18 FNO: C, 76.30; H, 6.40; F, 6.71; N, 4.94; O, Found: C, 76.29; H, 6.40; N, Trans isomer : Mp o C; Rf (20% EtOAc/n-hexane) 0.48.; 1 H NMR (300 MHz, CDCl 3 ), : (m, 2H), (m, 1H), (m, 1H); 2.07 (m, 1H), 3.71 (dt, J = 2.2, 11.3 Hz, 1H), 3.91 (br s, 1H), 4.08 (dd, J = 3.7, 10.5 Hz, 1H), 4.31 (d, J = 2.2 Hz, 1H), 4.64 (d, J =10.5 Hz, 1H), (2d, J = 4.5 Hz, 1H), 6.81(dt, J = 3.0, 8.3 Hz, 1H), (dd, J = 3.0, 9.0 Hz, 1H), (m, 5H); MS (ESI) m/z 284 ([M+H]) +. Anal. Calcd. for C 18 H 18 FNO: C, 76.30; H, 6.40; F, 6.71; N, 4.94; O, Found: C, 76.29; H, 6.41; N, Fluoro-6-(4-fluoro-phenyl)-5,6a,7,8,9,10a-hexahydro-6H-phenanthridin-10-one (4 & 5n): Cis isomer : Mp o C; Rf (20% EtOAc/n-hexane) 0.5.; 1 H NMR (300 MHz, CDCl 3 ), : (m, 3H), (m, 2H), (m, 2H), (m, 1H), 4.64 (d, J = 3.1 Hz, 1H), (m, 2H), (t, J = 7.8 Hz, 1H), (m, 4H); MS (ESI) m/z 314 ([M+H]) +. Anal. Calcd. for C 19 H 17 F 2 NO: C, 72.83; H, 5.47; F, 12.13; N, 4.47; O, Found: C, 72.80; H, 5.46; N, Trans isomer : Mp o C; Rf (20% EtOAc/n-hexane) 0.45.; 1 H NMR (300 MHz, CDCl 3 ), : (m, 2H); (m, 2H), (m, 2H), (m, 2H), (m, 1H), 4.54 (d, J = 2.0 Hz, 1H), (m, 2H), (t, J = 8.3 Hz, 1H),

8 7.32 (m, 4H); MS (ESI) m/z 314 ([M+H]) +. Anal. Calcd. for C 19 H 17 F 2 NO: C, 72.83; H, 5.47; F, 12.13; N, 4.47; O, Found: C, 72.85; H, 5.47; N, (2-Chloro-phenyl)-2,3,4a,11,12,12a-hexahydro-1H-4-oxa-11-aza-chrysene (Table 2, entry r): Cis isomer : m.p o C; Rf (20% EtOAc/n-hexane) 0.5.; 1 H NMR (300 MHz, CDCl 3 ), : (m, 3H), 2.48 (m, 1H), (m, 1H), (m, 1H), (m, 1H), 5.18 (d, J = 2.6 Hz, 1H), 5.45 (d, J = 6.4, Hz 1H), (m, 2H), (m, 5H), (m, 2H), 7.93 (d, J = 2.07 Hz, 1H); MS (ESI) m/z 350 ([M+H]) +. Anal. Calcd. for C 22 H 20 ClNO: C, 75.53; H, 5.76; Cl, 10.13; N, 4.00; O, Found: C, 75.53; H, 5.74; N, Trans isomer : Thick syrup; Rf (20% EtOAc/n-hexane) 0.48.; 1 H NMR (300 MHz, CDCl 3 ), : (m, 3H), 2.29 (m, 1H), (m, 1H), (m, 1H), (m, 1H), 4.61 (d, J = 3.6 Hz, 1H), 5.31 (d, J = 10.9 Hz, 1H), (m, 6H), (m, 4H); MS(ESI) m/z 350 ([M+H]) +. Anal. Calcd. for C 22 H 20 ClNO: C, 75.53; H, 5.76; Cl, 10.13; N, 4.00; O, Found: C, 75.55; H, 5.75; N,

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