反应详情

A mixture of 2-chloro-4-fluoro-3-((trimethylsilyl)ethynyl)benzonitrile (Example 32B) (0.120 g, 0.477 mmol), (S)-1-(methylthio)propan-2-amine (0.075 g, 0.715 mmol) (prepared essentially as described in US2005182275A1) and DIEA (0.166 mL, 0.953 mmol) in DMSO (2 mL) was heated (sealed tube) at 100° C. for 45 min. Upon cooling, the reaction mixture was diluted with EtOAc (25 mL) and washed with water (20 mL). The organic phase was washed with water and brine, dried over Na2SO4, filtered and concentrated to give the intermediate (S)-2-chloro-3-ethynyl-4-((1-(methylthio)propan-2-yl)amino)benzonitrile. This intermediate was dissolved in NMP (2 mL), treated with KOtBu (1 M in THF) (1.430 mL, 1.430 mmol) and heated at 60° C. The reaction was monitored by LCMS, and after 45 min, additional KOtBu (1 M in THF) (1.430 mL, 1.430 mmol) was added and heating continued for another 1 h. Upon cooling, the reaction mixture was diluted with EtOAc (25 mL) and washed with water (20 mL). The organic phase was washed with water and brine, dried over Na2SO4, filtered and concentrated. The residue was chromatographed over silica gel using a 5-30% EtOAc-hexane gradient to give (S)-4-chloro-1-(1-(methylthio)propan-2-yl)-1H-indole-5-carbonitrile (0.056 g, 42% yield): MS (ESI): m/z 265 (M+H).

1. customprepared essentially
2. temperaturewas heated
3. custom(sealed tube) at 100° C. for 45 min
4. temperatureUpon cooling
5. washwashed with water (20 mL)
6. washThe organic phase was washed with water and brine
7. dry with materialdried over Na2SO4
8. filtrationfiltered
9. concentrationconcentrated