(2R,4R)-2-ethyl-4-hydroxy-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-methylsulfanyl-ethyl ester 、 (2R,4S)-2-ethyl-4-hydroxy-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-methylsulfanyl-ethyl ester 在
乙酸酐 作用下,
以
二甲基亚砜 为溶剂,
反应 23.0h,
生成
(2R)-2-ethyl-4-oxo-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-methylsulfanyl-ethyl ester