反应详情

A 3.9 ml portion of cyclopropylamine was added dropwise to a solution of 16.25 g of 2-chloro-α-(ethoxymethylene)-4,5-difluoro-β-oxobenzenepropanoic acid, ethyl ester in 45 ml of ethanol, producing an exotherm. The solution was stirred for 1 hour, evaporated to dryness and the residue crystallized from hexane, giving 14.6 g of the desired compound, mp 55°-58° C.

1. customproducing an exotherm
2. customevaporated to dryness
3. customthe residue crystallized from hexane