Hydrochloric Acid → 3-(8-bromo-N-methyl-4,5-dihydrobenzo[b]thieno[2,3-d]oxepine-2-carboxamido)-4-chlorobenzoic acid

Participants

Reaction Steps

To a suspension of methyl 3-(8-bromo-N-methyl-4,5-dihydrobenzo[b]thieno[2,3-d]oxepine-2-carboxamido)-4-chlorobenzoate (31 g, 61 mmol) in THF (200 mL) and H2O (100 mL) was added LiOH.H2O (6.42 g, 153 mmol). The reaction mixture was stirred at room temperature overnight. Then it was acidified with 2N HCl to pH 2-3, and concentrated to remove most of solvent. The resulting precipitate was washed by water, dried to give the carboxylic acid, 3-(8-bromo-N-methyl-4,5-dihydrobenzo[b]thieno[2,3-d]oxepine-2-carboxamido)-4-chlorobenzoic acid (27.3 g, 91%). LC-MS: (ESI, m/z)=494 [M+1]+

Provenance & Evidence