Phenylboronic Acid → Isopropyl 5-[acetyl-(3,5-bistrifluoromethylbenzyl)amino]-8-phenyl-2,3,4,5-tetrahydrobenzo[b]azepine-1-carboxylate

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Reaction Steps

Add a solution of isopropyl-5-[acetyl-(3,5-bistrifluoromethylbenzyl)amino]-8-bromo-2,3,4,5-tetrahydrobenzo[b]azepine-1-carboxylate (0.080 g, 0.134 mmol) in tetrahydrofuran (1 mL) to phenylboronic acid (0.024 g, 0.202 mmol), palladium acetate (0.0015 g, 0.0067 mmol), 2-(dicyclohexylphosphino)biphenyl (0.0047 g, 0.013 mmol) and potassium fluoride (0.023 g, 0.403 mmol) and purge with nitrogen and stir for 2 h at room temperature, then at 50° C. for 12 h. After this initial period, additional phenylboronic acid (0.024 g, 0.202 mol), palladium acetate (0.0015 g, 0.0067 mmol), 2-(dicyclohexylphosphino)biphenyl (0.0047 g, 0.013 mmol) and potassium fluoride (0.023 g, 0.403 mmol) is added and the reaction is heated at 50° C. for 1 h. Cool the reaction to room temperature and dilute with ethyl acetate (30 mL) and wash with 2 N sodium hydroxide and brine (10 mL each). Dry the organic layer over sodium sulfate, filter and remove the solvent under reduced pressure. Purify the residue using chromatography on silica gel, eluting with hexanes/ethyl acetate (60:40), to provide the title compound as a white solid (0.058 g, 72%): ESI MS 593 (M+H).

Provenance & Evidence