methylenedimethylaminoammonium chloride 、
(2R,3S,4R)-3-Methoxycarbonylmethyl-4-(2-oxo-ethyl)-pyrrolidine-1,2-dicarboxylic acid 1-benzyl ester 2-methyl ester 反应 20.0h,
以62%的产率得到(2R,3S,4S)-4-(1-Formyl-vinyl)-3-methoxycarbonylmethyl-pyrrolidine-1,2-dicarboxylic acid 1-benzyl ester 2-methyl ester