反应详情

To a solution of 6-(methylthio)-1-(phenylsulfonyl)-1H-indole (890 mg, 2.93 mmol) in anhydrous THF (10 mL) at 0° C. under nitrogen was added n-BuLi (5.86 mL, 14.65 mmol, 2.5 M). After stirring for 30 min, isobutyraldehyde (1.05 g, 14.65 mmol) was added. The reaction mixture was stirred at 0° C. for 1 h and quenched with sat. aq NH4Cl (10 mL) at 0° C. and extracted with EtOAc (20 mL×3). The combined organic layers were dried over anhydrous sodium sulfate, filtered, concentrated and purified by column chromatography on silica gel eluted with (petroleum ether/EtOAc 20:1) to give 2-methyl-1-(6-(methylthio)-1H-indol-2-yl)propan-1-one (440 mg, 64.28% yield) as a colorless oil. LC-MS MS (ESI) m/z 234.1 [M+H]+. 1H NMR (CDCl3 400 MHz): δ 8.86 (brs, 1H), 7.52 (d, J=8.4 Hz, 1H), 7.19 (s, 1H), 7.14-7.11 (m, 1H), 7.01 (dd, J1=8.4 Hz, J2=1.6, 1H), 3.42-3.38 (m, 1H), 2.47 (s, 3H), 1.20 (d, J=6.8 Hz, 6H).

1. stirringThe reaction mixture was stirred at 0° C. for 1 h
2. customquenched with sat. aq NH4Cl (10 mL) at 0° C.
3. extractionextracted with EtOAc (20 mL×3)
4. dry with materialThe combined organic layers were dried over anhydrous sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated
7. custompurified by column chromatography on silica gel
8. washeluted with (petroleum ether/EtOAc 20:1)