重氮甲烷 、
[(3aR,5R,6R,6aR)-6-((E)-But-1-enyl)-5-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-6-yloxy]-acetic acid 在
lithium diisopropyl amide 作用下,
生成 (2S,3R)-3-[(3aR,5S,6aR)-5-((R)-2,2-Dimethyl-[1,3]dioxolan-4-yl)-2,2-dimethyl-dihydro-furo[2,3-d][1,3]dioxol-(6Z)-ylidenemethyl]-2-hydroxy-pentanoic acid methyl ester 、 (2R,3R)-3-[(3aR,5S,6aR)-5-((R)-2,2-Dimethyl-[1,3]dioxolan-4-yl)-2,2-dimethyl-dihydro-furo[2,3-d][1,3]dioxol-(6Z)-ylidenemethyl]-2-hydroxy-pentanoic acid methyl ester