反应详情

25.5 g of 3- (5-chloro-3-fluoropyridin-2-yl)-2-methyl-3-oxopropionic acid tert-but yl ester (Example P34) are added dropwise to 30 ml of a 33% solution of hydrogen bromide (HBr) in glacial acetic acid to form a suspension. The mixture is subsequently stirred for 90 minutes and then introduced into 300 ml of ice-water. The resulting precipitate is filtered off, washed with water and dried. 15.9 g of the desired title compound are obtained in the form of a solid having a melting point of 101-102° C.

1. customto form a suspension
2. filtrationThe resulting precipitate is filtered off
3. washwashed with water
4. customdried