二氯亚甲基二甲基氯化铵 、 Dimethyl-carbamic acid (1S,2S,3S,4S)-5-chloro-1-chloromethyl-4-dimethylcarbamoyloxy-2,3-dihydroxy-pentyl ester 以
1,4-二氧六环 为溶剂,
以28%的产率得到Dimethyl-carbamic acid (1R,2R,3R)-2,4-dichloro-1-((R)-2-chloro-1-dimethylcarbamoyloxy-ethyl)-3-dimethylcarbamoyloxy-butyl ester