反应详情

Tert-Butyl 3-cyclohexyl-2-phenyl-1H-indole-6-carboxylate (from Step 5) was dissolved in DMF (0.18 M). NaH (60% suspension in mineral oil, 1.5 eq.) was added and the resultant mixture stirred for 5 min at RT, then for another 5 min at 50° C. The solution was allowed to reach RT, and then neat 2-chloro-N,N-dimethylacetamide (1.6 eq.) was added dropwise. After 1 h analytical RP HPLC indicated complete conversion of the starting material. The mixture was diluted with EtOAc, and then washed with water (3×) and brine. Drying over Na2SO4 and evaporation gave a colorless solid, which was purified by flash chromatography on silica gel using PE/EtOAc (3:1, then 2:1) as the eluent. The resulting colorless solid was immediately dissolved in a mixture of DCM and TFA (0.05 M, 1:1, v/v). After stirring for 30 min at RT, the solvents were removed in vacuo to give after drying under high-vacuum, the title compound as a light yellow foam. 1H NMR (400 MHz, DMSO-d6, 300 K) δ 1.12-1.31 (m, 3H), 1.60-1.75 (m, 5H), 1.80-1.92 (m, 2H), 2.53-2.59 (m, 1H), 2.80 (s, 3H), 2.89 (s, 3H), 4.84 (s, 2H), 7.31 (d, J 6.4, 2H), 7.48-7.53 (m, 3H), 7.64 (d, J 8.4, 1H), 7.81 (d, J 8.4, 1H), 7.92 (s, 1H,); MS (ES+) m/z 405 (M+H)+

1. customto reach RT
2. waitAfter 1 h analytical RP HPLC indicated complete
3. washwashed with water (3×) and brine
4. dry with materialDrying over Na2SO4 and evaporation
5. customgave a colorless solid, which
6. customwas purified by flash chromatography on silica gel using PE/EtOAc (3:1
7. dissolutionThe resulting colorless solid was immediately dissolved in a mixture of DCM and TFA (0.05 M, 1:1
8. customthe solvents were removed in vacuo
9. customto give
10. customafter drying under high-vacuum