Trifluoroacetic acid → Ethyl 9-bromo-4-methyl-4,5-dihydrobenzo[2,3]oxepino[4,5-d]thiazole-2-carboxylate

Participants

Reaction Steps

TFA (891 mg, 7.88 mmol, 30.00 equiv) was added dropwise to a stirred solution of ethyl 9-bromo-4-hydroxy-4-methyl-4,5-dihydrobenzo[2,3]oxepino[4,5-d]thiazole-2-carboxylate (100 mg, 0.26 mmol, 1.00 equiv) and Et3SiH (454 mg, 3.90 mmol, 15.00 equiv) in dichloromethane (5 mL) at 0° C. After being stirred at room temperature overnight the reaction was quenched with 10 mL of saturated NaHCO3, extracted with 5×20 mL of ethyl acetate, dried over anhydrous sodium sulfate, and concentrated under vacuum. The residue was purified by a silica gel column with ethyl acetate/petroleum ether (1:15) to give 70 mg (73%) of the titled compound as a light yellow solid; LC-MS (ES, m/z) 368, 369 [M+11]+.

Provenance & Evidence