Acetic Acid → Methyl 2-[5-bromo-2-(4-methanesulfonylphenyl)thiophen-3-yl]acetate

Participants

Reaction Conditions

Reaction Steps

NBS (209 mg, 1.18 mmol) was added in small portions to a stirred solution of Intermediate Y (365 mg, 1.18 mmol) in a mixture of MeOH (10 ml) and chloroform (5 ml) at 0° C. AcOH (0.250 ml) was added and the reaction was stirred at 0° C. for 1 hour then at r.t. for 3 hours. More NBS (35 mg, 0.20 mmol) was added at 0° C. and the reaction was stirred at r.t. over night. A new reaction was also started. NBS (342 mg, 1.92 mmol) was added in small portions to a stirred solution of Intermediate Y (519 mg, 1.67 mmol) in a mixture of MeOH (15 ml) and chloroform (7 ml) at 0° C. AcOH (0.50 ml) was added and the reaction was stirred at r.t. over night.

Provenance & Evidence