(E)-but-2-enyl N,N-diisopropylcarbamate 、
(E)-4-((2R,4S,6R,8R,9S)-8-Isopropyl-9-methyl-4-triethylsilanyloxy-1,7-dioxa-spiro[5.5]undec-2-yl)-2-methyl-but-2-enal 在
titanium(IV) isopropylate 、
仲丁基锂 、
鹰爪豆碱 作用下,
生成 <2R(2E,6Z,4R,5R),4S,6S,8R,9S> 2-<7-<(N,N-diisopropylcarbamoyl)oxy>-4-hydroxy-3,5-dimethyl-hepta-2,6-dienyl>-8-isopropyl-9-methyl-4-<(triethylsilyl)oxy>-1,7-dioxaspiro-<5.5>undecane 、 <2R(2E,6Z,4S,5S),4S,6S,8R,9S> 2-<7-<(N,N-diisopropylcarbamoyl)oxy>-4-hydroxy-3,5-dimethyl-hepta-2,6-dienyl>-8-isopropyl-9-methyl-4-<(triethylsilyl)oxy>-1,7-dioxaspiro-<5.5>undecane