(2R,5S)-5-(3,4-Dimethoxy-phenyl)-2-(4-hydroxy-3-methoxy-benzyl)-oxazolidine-3-carboxylic acid 2,2,2-trichloro-ethyl ester 在
三氟代氧化钒(V) 、
三氟乙酸酐 作用下,
以
二氯甲烷 、
三氟乙酸 为溶剂,
生成 2,2,2-trichloroethyl (1S,8R,10R)-1',4,5-trimethoxy-6'-oxospiro[13-oxa-11-azatricyclo[8.2.1.02,7]trideca-2,4,6-triene-8,3'-cyclohexa-1,4-diene]-11-carboxylate 、 2,2,2-trichloroethyl (1S,8S,10R)-1',4,5-trimethoxy-6'-oxospiro[13-oxa-11-azatricyclo[8.2.1.02,7]trideca-2,4,6-triene-8,3'-cyclohexa-1,4-diene]-11-carboxylate