2,2-Dimethyl-propionic acid (2R,4S,6S,8R,9S)-8-((S)-sec-butyl)-9-methyl-2-((E)-3-methyl-4-oxo-but-2-enyl)-1,7-dioxa-spiro[5.5]undec-10-en-4-yl ester 、
(4S,5S)-((E)-2-But-2-enyl)-[1,3,2]dioxaborolane-4,5-dicarboxylic acid dimethyl ester 在
4 A molecular sieve 作用下,
以
甲苯 为溶剂,
反应 1.5h,
生成 2,2-Dimethyl-propionic acid (2R,4S,6S,8R,9S)-8-((S)-sec-butyl)-2-((E)-(4S,5S)-4-hydroxy-3,5-dimethyl-hepta-2,6-dienyl)-9-methyl-1,7-dioxa-spiro[5.5]undec-10-en-4-yl ester 、 2,2-Dimethyl-propionic acid (2R,4S,6S,8R,9S)-8-((S)-sec-butyl)-2-((E)-(4R,5R)-4-hydroxy-3,5-dimethyl-hepta-2,6-dienyl)-9-methyl-1,7-dioxa-spiro[5.5]undec-10-en-4-yl ester