Dimethylformamide → (3R)-2-(4-chloro-2-fluorophenyl)-4,4,4-trifluoro-3-methylbutanoyl chloride

Participants

Reaction Steps

660 mg (2.32 mmol) of (3R)-2-(4-chloro-2-fluorophenyl)-4,4,4-trifluoro-3-methylbutanoic acid (diastereomer mixture) were dissolved in 2 ml of dichloromethane. After addition of a small drop of DMF, the reaction solution was cooled to from −5° C. to 0° C., and 0.4 ml (4.64 mmol) of oxalyl chloride was added dropwise. Cooling was removed and the reaction mixture was stirred at RT for 1 h until the evolution of gas had ceased. The mixture was then concentrated under reduced pressure. The residue was twice taken up in abs. dichloromethane, in each case reconcentrated under reduced pressure and the residue was finally dried under high vacuum. This gave 640 mg of the target product which was directly, without further purification, reacted further.

Provenance & Evidence