(2R,4R,5R,6R)-4,5-Diacetoxy-6-[(R)-1-acetoxy-2-(diphenoxy-phosphoryloxy)-ethyl]-2-hydroxy-tetrahydro-pyran-2-carboxylic acid methyl ester 在
(氯亚甲基)二甲基氯化铵 作用下,
以
二氯甲烷 为溶剂,
以75%的产率得到(2S,4R,5R,6R)-4,5-Diacetoxy-6-[(R)-1-acetoxy-2-(diphenoxy-phosphoryloxy)-ethyl]-2-chloro-tetrahydro-pyran-2-carboxylic acid methyl ester