反应详情

温度

0 °C

A solution of 2-(3-chloro-4-methanesulfonyl-phenyl)-3-((R)-3,3-difluoro-cyclopentyl)-propionic acid (240 mg, 0.65 mmol) was dissolved in methylene chloride (10 mL) and N,N-dimethylformamide (one drop) and cooled to 0° C. To this solution was added dropwise a solution of oxalyl chloride in methylene chloride (2 M solution, 376 μL, 0.75 mmol) which produced gas evolution and was stirred at 0° C. for 15 min and then warmed to 25° C. and stirred for 1 h. After this time, the reaction was concentrated in vacuo to about 2 mL and then another portion of methylene chloride (˜2 mL) was added to produce a roughly 0.16 M solution of 2-(3-chloro-4-methanesulfonyl-phenyl)-3-((R)-3,3-difluoro-cyclopentyl)-propionyl chloride which was used.

1. customproduced gas evolution
2. temperaturewarmed to 25° C.
3. stirringstirred for 1 h
4. concentrationAfter this time, the reaction was concentrated in vacuo to about 2 mL
5. additionanother portion of methylene chloride (˜2 mL) was added