Benzoic acid (2S,3S,4S,5S,6R,8R,9R,11R)-9-benzyloxy-2-ethyl-3-hydroxy-8-((1S,2S,3R)-2-hydroxy-3-methoxycarbonyl-1-methyl-butyl)-3,5,9,11-tetramethyl-1,7-dioxa-spiro[5.5]undec-4-yl ester 在
potassium carbonate 作用下,
以
甲醇 为溶剂,
反应 2.0h,
以95%的产率得到(2R,3S,4S)-4-((2R,3R,5R,6R,8S,9R,10S,11S)-3-Benzyloxy-8-ethyl-9,10-dihydroxy-3,5,9,11-tetramethyl-1,7-dioxa-spiro[5.5]undec-2-yl)-3-hydroxy-2-methyl-pentanoic acid methyl ester