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