(S)-3-(Toluene-4-sulfonylamino)-2-(3-trifluoromethyl-benzoylamino)-propionic acid methyl ester 在
bis(triphenyl) oxodiphosphonium trifluoromethanesulfonate 作用下,
以
二氯甲烷 为溶剂,
反应 0.5h,
生成 (R)-1-(Toluene-4-sulfonyl)-2-(3-trifluoromethyl-phenyl)-4,5-dihydro-1H-imidazole-4-carboxylic acid methyl ester 、 (S)-1-(Toluene-4-sulfonyl)-2-(3-trifluoromethyl-phenyl)-4,5-dihydro-1H-imidazole-4-carboxylic acid methyl ester