HCID 86674082, compound → tert-Butyl (2S,3aS,7aS)-2-(6-bromo-1H-benzo[d]imidazol-2-yl)octahydro-1H-indole-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

An isomeric mixture (14) of (2S,3aS,7aS)-tert-butyl 2-((2-amino-4-bromophenyl)carbamoyl)octahydro-1H-indole-1-carboxylate and (2S,3aS,7aS)-tert-butyl 2-((2-amino-5-bromophenyl)carbamoyl)octahydro-1H-indole-1-carboxylate (160 g, 0.36 mol) was dissolved in acetic acid (480 mL) and the reaction mixture was stirred at 65° C. until the starting materials were consumed (as judged by LC-MS analysis). The reaction was cooled to rt and the solvent was removed under vacuum. The remaining residue was dissolved in ethyl acetate (500 mL) and aq ammonia (100 mL) was added carefully. Additional water (100 mL) was added and the organic layer was separated and collected. The aq phase was extracted with ethyl acetate (2×300 mL). The combined organic phase was washed with water (200 mL), followed by brine (200 mL), and dried over MgSO4. The solution was concentrated and the remaining residue was purified by silica gel column chromatography (hexanes/ethyl acetate) to afford (2S,3aS,7aS)-tert-butyl 2-(6-bromo-1H-benzo[d]imidazol-2-yl)octahydro-1H-indole-1-carboxylate (15) (140 g).

Provenance & Evidence