A facile and general route to 3-((trifluoromethyl)thio)benzofurans and 3-((trifluoromethyl)thio)benzothiophenes
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1 Electronic Supplementary Material (ESI) for ChemComm. This journal is The Royal Society of Chemistry 2014 A facile and general route to 3-((trifluoromethyl)thio)benzofurans and 3-((trifluoromethyl)thio)benzothiophenes Jie Sheng, a Congbin Fan, a and Jie Wu*,ab a Department of Chemistry, Fudan University, 220 Handan Road, Shanghai , China b State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai , China jie_wu@fudan.edu.cn Supporting Information 1. General experimental methods (S2). 2. General experimental procedure and characterization data (S2-S9) F, 1 H and 13 C NMR spectra of compound 3 (S10-S69). 1
2 General Materials and Methods: Unless otherwise stated, all commercial reagents were used as received. All solvents were dried and distilled according to standard procedures. Flash column chromatography was performed using silica gel (60-Å pore size, 32 63µm, standard grade). Analytical thin layer chromatography was performed using glass plates pre-coated with 0.25 mm mesh silica gel impregnated with a fluorescent indicator (254 nm). Thin layer chromatography plates were visualized by exposure to ultraviolet light. Organic solutions were concentrated on rotary evaporators at ~20 Torr at C. Nuclear magnetic resonance (NMR) spectra are recorded in parts per million from internal tetramethylsilane on the δ scale. 1 H and 13 C NMR spectra were recorded in CDCl 3 on a Bruker DRX-400 spectrometer operating at 400 MHz and 100 MHz, respectively. All chemical shift values are quoted in ppm and coupling constants quoted in Hz. High resolution mass spectrometry (HRMS) spectra were obtained on a microtof II Instrument. General procedure for the synthesis of 3-((trifluoromethyl)thio)benzofurans and 3-((trifluoromethyl)thio)benzothiophenes. R 1 XMe H BiCl X 3 (2.0 equiv) + N R Ph 1 SCF3 DCE, 85! C R 2 air SCF X = O, S 3 R 2 Trifluoromethanesulfanylamide 2 (0.22 mmol, 42.5 mg) was added to a solution of compound 1 (0.2 mmol) and BiCl 3 (0.4 mmol, mg) in DCE (2.0 ml), and the solution was stirred at 85 C for hours. After completion of the reaction as indicated by TLC, the reaction mixture was filtered by silica gel and washed by CH 2 Cl 2 (3 5.0 ml). The solution was concentrated in vacuo and the residue was purified by column chromatography on silica gel to provide the product 3. O SCF 3 2
3 2-Phenyl-3-(trifluoromethylthio)benzofuran (3a) White solid; mp: C; 1 H NMR (400 MHz, CDCl 3 ) δ (m, 2H), (m, 4H), (m, 1H), 8.20 (d, J = 7.2 Hz, 2H); 13 C NMR (100 MHz, CDCl 3 ) δ 97.5, 111.4, 120.2, 124.1, 125.7, 128.0, 128.7, 128.9, (q, J = Hz), 130.2, 130.9, 153.7, 160.1; 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 15 H 9 F 3 OS: (M + ), found: O O SCF 3 2-(4-Methoxyphenyl)-3-(trifluoromethylthio)benzofuran (3b) White solid; mp: C; 1 H NMR (400 MHz, CDCl 3 ) δ 3.92 (s, 3H), 7.06 (d, J = 8.9 Hz, 2H), (m, 2H), (m, 1H), (m, 1H), 8.23 (d, J = 8.9 Hz, 2H); 13 C NMR (100 MHz, CDCl 3 ) δ 55.4, 95.6, 111.2, 114.1, 119.9, 121.5, 123.9, 125.2, (q, J = Hz), 129.5, 131.1, 153.4, 160.2, 161.1; 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 16 H 11 F 3 O 2 S: (M + ), found: O SCF 3 2-p-Tolyl-3-(trifluoromethylthio)benzofuran (3c) White solid; mp: C; 1 H NMR (400 MHz, CDCl 3 ) δ 2.41 (s, 3H), 7.29 (d, J = 8.1 Hz, 2H), (m, 2H), (m, 1H), (m, 1H), 8.10 (d, J = 8.2 Hz, 2H); 13 C NMR (100 MHz, CDCl 3 ) δ 21.4, 96.5, 111.2, 119.9, 123.9, 125.4, 126.0, 127.7, , (q, J = Hz), 140.4, 153.5, 160.3; 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 16 H 11 F 3 OS: (M + ), found: O Cl SCF 3 2-(4-Chlorophenyl)-3-(trifluoromethylthio)benzofuran (3d) Yellow solid; mp: C; 1 H NMR (400 MHz, CDCl 3 ) δ (m, 2H), 3
4 7.47 (dd, J 1 = 1.8 Hz, J 2 = 6.9 Hz, 2H), (m, 1H), (m, 1H), 8.23 (dd, J 1 = 1.8 Hz, J 2 = 6.9 Hz, 2H); 13 C NMR (100 MHz, CDCl 3 ) δ 97.8, 111.3, 120.1, 124.1, 125.9, 127.2, 128.9, 129.0, (q, J = Hz), 130.6, 136.2, 153.5, 158.7; 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 15 H 8 ClF 3 OS: (M + ), found: O F SCF 3 2-(4-Fluorophenyl)-3-(trifluoromethylthio)benzofuran (3e) White solid; mp: C; 1 H NMR (400 MHz, CDCl 3 ) δ 7.22 (t, J = 8.4 Hz, 2H), (m, 2H), (m, 1H), 7.76 (d, J = 7.9 Hz, 1H), 8.23 (dd, J 1 = 5.5 Hz, J 2 = 7.8 Hz, 2H); 13 C NMR (100 MHz, CDCl 3 ) δ 97.2, 111.4, (d, 2 J CF = 21.8 Hz), 120.2, 124.2, 125.1, 125.8, (q, J = Hz), (d, 3 J CF = 8.4 Hz), 130.8, 153.6, 159.1, (d, 1 J CF = Hz); 19 F NMR (378 MHz, CDCl 3 ) δ (s), (s); HRMS (EI) calcd for C 15 H 8 F 4 OS: (M + ), found: O SCF 3 2-Cyclopropyl-3-(trifluoromethylthio)benzofuran (3f) White solid; mp: C; 1 H NMR (400 MHz, CDCl 3 ) δ (m, 2H), (m, 2H), (m, 1H), (m, 2H), 7.37 (d, J = 7.8 Hz, 1H), 7.58 (d, J = 7.3 Hz, 1H); 13 C NMR (100 MHz, CDCl 3 ) δ 8.3, 8.6, 96.7, 111.0, 118.8, 123.7, 124.3, (q, J = Hz), 130.1, 153.2, 167.0; 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 12 H 9 F 3 OS: (M + ), found: O SCF 3 2-tert-Butyl-3-(trifluoromethylthio)benzofuran (3g) Colorless oil; 1 H NMR (400 MHz, CDCl 3 ) δ 1.57 (s, 9H), (m, 2H), (m, 1H), (m, 1H); 13 C NMR (100 MHz, CDCl 3 ) δ 29.7, 31.9, 4
5 95.9, 111.0, 119.7, 123.5, 124.7, (q, J = Hz), 152.9, 171.3; 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 13 H 13 F 3 OS: (M + ), found: O Cl SCF 3 5-Chloro-2-phenyl-3-(trifluoromethylthio)benzofuran (3i) White solid; mp: C; 1 H NMR (400 MHz, CDCl 3 ) δ 7.32 (dd, J 1 = 2.1 Hz, J 2 = 8.7 Hz, 1H), 7.45 (d, J = 8.7 Hz, 1H), (m, 3H), 7.69 (d, J = 1.3 Hz, 1H), (m, 2H); 13 C NMR (100 MHz, CDCl 3 ) δ 97.0, 112.5, 119.8, 126.0, 127.9, 128.4, 128.7, (q, J = Hz), 130.0, 130.5, 132.3, 152.0, 161.4; 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 15 H 8 ClF 3 OS: (M + ), found: O O 2 N SCF 3 5-Nitro-2-phenyl-3-(trifluoromethylthio)benzofuran (3j) Yellow solid; mp: C; 1 H NMR (400 MHz, CDCl 3 ) δ (m, 3H), 7.62 (d, J = 9.0 Hz, 1H), (m, 2H), 8.10 (dd, J 1 = 2.1 Hz, J 2 = 9.0 Hz, 1H), 8.61 (s, 1H); 13 C NMR (100 MHz, CDCl 3 ) δ 98.3, 112.0, 116.6, 121.4, 125.2, 128.0, , , (q, J = Hz), 131.2, 145.2, 156.2, 163.1; 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 15 H 8 F 3 NO 3 S: (M + ), found: O O SCF 3 6-Methoxy-2-phenyl-3-(trifluoromethylthio)benzofuran (3k) Yellow solid; mp: C; 1 H NMR (400 MHz, CDCl 3 ) δ 3.96 (s, 3H), (m, 3H), 7.56 (d, J = 8.6 Hz, 1H), 8.10 (dd, J 1 = 1.6 Hz, J 2 = 8.6 Hz, 1H), (m, 2H), 8.44 (s, 1H); 13 C NMR (100 MHz, CDCl 3 ) δ 52.2, 98.0, 111.3, 122.4, 126.6, 127.4, 127.9, 128.7, (q, J = Hz), 130.6, 130.9, 156.1, 161.4, 5
6 166.7; 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 16 H 11 F 3 O 2 S: (M + ), found: O O SCF 3 4-Methoxy-2-phenyl-3-(trifluoromethylthio)benzofuran (3l) Yellow solid; mp: C; 1 H NMR (400 MHz, CDCl 3 ) δ 3.97 (s, 3H), 6.76 (d, J = 8.0 Hz, 1H), 7.17 (d, J = 8.2 Hz, 1H), 7.29 (t, J = 8.2 Hz, 1H), (m, 3H), (m, 2H); 13 C NMR (100 MHz, CDCl 3 ) δ 55.7, 96.6, 104.4, 105.0, 114.6, 119.4, 126.2, 128.1, 128.5, (q, J = Hz), 129.0, 129.9, 154.9, 155.0; 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 16 H 11 F 3 O 2 S: (M + ), found: S SCF 3 2-Phenyl-3-(trifluoromethylthio)benzo[b]thiophene (3m) White solid; mp: C; 1 H NMR (400 MHz, CDCl 3 ) δ (m, 5H), (m, 2H), 7.87 (d, J = 8.0 Hz, 1H), 8.10 (d, J = 8.1 Hz, 1H); 13 C NMR (100 MHz, CDCl 3 ) δ 111.1, 122.1, 123.7, , , 128.5, 129.3, (q, J = Hz), 130.2, 132.6, 137.9, 141.3, 154.3; 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 15 H 9 F 3 S 2 : (M + ), found: S Cl SCF 3 2-(4-Chlorophenyl)-3-(trifluoromethylthio)benzo[b]thiophene (3n) Yellow solid; mp: C; 1 H NMR (400 MHz, CDCl 3 ) δ (m, 3H), (m, 1H), 7.59 (d, J = 8.0 Hz, 2H), 7.85 (d, J = 7.9 Hz, 1H), 7.07 (d, J = 8.0 Hz, 1H); 13 C NMR (100 MHz, CDCl 3 ) δ 103.2, 122.1, 123.7, 125.6, 125.7, 128.8, (q, J = Hz), 131.0, 131.4, 135.6, 137.8, 141.2, 152.7; 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 15 H 8 ClF 3 S 2 : (M + ), found:
7 S SCF 3 2-p-Tolyl-3-(trifluoromethylthio)benzo[b]thiophene (3o) Yellow solid; mp: C; 1 H NMR (400 MHz, CDCl 3 ) δ 2.45 (s, 3H), 7.31 (d, J = 7.1 Hz, 2H), (m, 1H), (m, 1H), 7.58 (d, J = 7.1 Hz, 2H), 7.85 (d, J = 7.8 Hz, 1H), 8.09 (d, J = 7.8 Hz, 1H); 13 C NMR (100 MHz, CDCl 3 ) δ 21.3, 110.6, 122.1, 123.5, , , (q, J = Hz), , 129.7, 130.0, 137.8, 139.5, 141.4, 154.5; 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 16 H 11 F 3 S 2 : (M + ), found: S O SCF 3 2-(4-Methoxyphenyl)-3-(trifluoromethylthio)benzo[b]thiophene (3p) Yellow solid; mp: C; 1 H NMR (400 MHz, CDCl 3 ) δ 3.87 (s, 3H), (m, 2H), (m, 1H), (m, 1H), (m, 2H), 7.83 (d, J = 7.9 Hz, 1H), 8.05 (d, J = 8.1 Hz, 1H); 13 C NMR (100 MHz, CDCl 3 ) δ 55.3, 110.1, 114.0, 122.0, 123.5, 124.9, 125.3, 125.4, (q, J = Hz), 131.4, 137.6, 141.4, 154.2, 160.5; 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 16 H 11 F 3 OS 2 : (M + ), found: S F SCF 3 2-(4-Fluorophenyl)-3-(trifluoromethylthio)benzo[b]thiophene (3q) White solid; mp: C; 1 H NMR (400 MHz, CDCl 3 ) δ (m, 2H), (m, 2H), (m, 2H), (m, 1H), (m, 1H); 13 C NMR (100 MHz, CDCl 3 ) δ 111.3, (d, 2 J CF = 21.8 Hz), 122.1, 123.7, , , 128.6, (q, J = Hz), (d, 3 J CF = 7.8 Hz), 137.8, 141.2, 153.0, (d, 1 J CF = Hz); 19 F NMR (378 MHz, CDCl 3 ) δ (s), (s); HRMS (EI) calcd for C 15 H 8 F 4 S 2 : (M + ), found:
8 S SCF 3 2-Cyclopropyl-3-(trifluoromethylthio)benzo[b]thiophene (3r) White solid; mp: C; 1 H NMR (400 MHz, CDCl 3 ) δ (m, 2H), (m, 2H), (m, 1H), (m, 1H), (m, 1H), 7.72 (d, J = 8.0 Hz, 1H), 7.91 (d, J = 8.0 Hz, 1H); 13 C NMR (100 MHz, CDCl 3 ) δ 11.9, 12.2, 111.0, 122.0, 122.2, 124.6, 125.2, (q, J = Hz), 135.6, 141.3, 161.5; 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 12 H 9 F 3 S 2 : (M + ), found: S SCF 3 2-tert-Butyl-3-(trifluoromethylthio)benzo[b]thiophene (3s) White solid; mp: C; 1 H NMR (400 MHz, CDCl 3 ) δ 1.63 (s, 9H), (m, 1H), (m, 1H), 7.79 (d, J = 8.0 Hz, 1H), 8.00 (d, J = 8.1 Hz, 1H); 13 C NMR (100 MHz, CDCl 3 ) δ 31.7, 36.7, 109.3, 121.7, 122.7, 124.7, 124.9, (q, J = Hz), 135.7, 142.3, 166.3; 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 13 H 13 F 3 S 2 : (M + ), found: S SCF 3 2-Butyl-3-(trifluoromethylthio)benzo[b]thiophene (3t) Colorless oil; 1 H NMR (400 MHz, CDCl 3 ) δ 0.97 (t, J = 7.1 Hz, 3H), (m, 2H), (m, 2H), 3.18 (t, J = 7.6 Hz, 2H), 7.35 (t, J = 7.4 Hz, 1H), (m, 1H), 7.78 (d, J = 8.0 Hz, 1H), 7.95 (d, J = 8.0 Hz, 1H); 13 C NMR (100 MHz, CDCl 3 ) δ 13.8, 22.4, 29.4, 33.4, 111.1, 122.2, 122.7, 124.8, 125.1, (q, J = Hz), 137.3, 140.7, 158.4; 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 13 H 13 F 3 S 2 : (M + ), found:
9 S TMS SCF 3 Trimethyl(3-(trifluoromethylthio)benzo[b]thiophen-2-yl)silane (3u) Yellow oil; 1 H NMR (400 MHz, CDCl 3 ) δ 0.50 (s, 9H), 7.43 (dd, J 1 = 0.8 Hz, J 2 = 8.0 Hz, 2H), (m, 1H), 7.88 (d, J = 7.9 Hz, 1H), 8.06 (d, J = 8.2 Hz, 1H); 13 C NMR (100 MHz, CDCl 3 ) δ 0.1, 12.9, 122.2, 123.0, 124.3, 125.0, 125.1, 125.6, 125.8, (q, J = Hz); 19 F NMR (378 MHz, CDCl 3 ) δ (s); HRMS (EI) calcd for C 12 H 13 F 3 S 2 Si: (M + ), found:
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