Acetic acid (4S,5S)-4-[(S)-1-[(S)-2-(tert-butyl-dimethyl-silanyloxy)-1-methyl-ethyl]-2-(2-trimethylsilanyl-ethoxymethoxymethyl)-allyl]-6,6,8-trimethyl-2-phenyl-1,3-dioxa-spiro[4.5]dec-7-en-7-ylmethyl ester 在
4 A molecular sieve 、
四丁基氟化铵 作用下,
以
四氢呋喃 为溶剂,
生成
Acetic acid (4S,5S)-4-[(S)-1-((S)-2-hydroxy-1-methyl-ethyl)-2-(2-trimethylsilanyl-ethoxymethoxymethyl)-allyl]-6,6,8-trimethyl-2-phenyl-1,3-dioxa-spiro[4.5]dec-7-en-7-ylmethyl ester