(2R,4R)-4-(tert-Butyl-dimethyl-silanyloxy)-2-(3-fluoro-2'-methanesulfonyl-biphenyl-4-ylcarbamoyl)-pyrrolidine-1-carboxylic acid tert-butyl ester 在
三氟乙酸 作用下,
以
4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran 为溶剂,
以100%的产率得到(2R,4R)-4-hydroxy-pyrrolidine-2-carboxylic acid (3-fluoro-2'-methanesulfonyl-biphenyl-4-yl)-amide