2,2,2-三氯乙酰胺苄酯 、 (2S,3S)-1,4-Dioxa-spiro[4.5]decane-2,3-dicarboxylic acid methyl ester (1R,2S,3S,4R,5S,6R)-2,4,6-tris-benzoyloxy-3,5-dihydroxy-cyclohexyl ester 在
三氟甲磺酸 作用下,
生成
(2S,3S)-1,4-Dioxa-spiro[4.5]decane-2,3-dicarboxylic acid methyl ester (1R,2S,3S,4R,5S,6R)-2,4,6-tris-benzoyloxy-3,5-bis-benzyloxy-cyclohexyl ester