1-(trimethylsiloxy)-1,3-butadiene 、
(3R)-3-(4,4-dimethyl-2-oxotetrahydrofuranyl) 2-methyl-3-oxo-1-cyclopentene-1-(2-diazoacetate) 在
rhodium(II) acetate dimer 作用下,
以
二氯甲烷 为溶剂,
反应 0.5h,
生成 (3R)-3-(4,4-dimethyl-2-oxotetrahydrofuranyl) 8aα-methyl-1-oxo-8β-(trimethylsilyl)oxy-2,3,8,8α-tetrahydro-4(5H)-azulenecarboxylate 、
(3R)-3-(4,4-dimethyl-2-oxotetrahydrofuranyl) 8aβ-methyl-1-oxo-8α-(trimethylsilyl)oxy-2,3,8,8α-tetrahydro-4(5H)-azulenecarboxylate