ethyl 2-diazo-3-oxo-4-(6-methyl-1,2,3,4,4aα,5,8,8aβ-octahydro-1-naphthylidene)butanoate 在
dirhodium tetraacetate 作用下,
以
二氯甲烷 为溶剂,
以55%的产率得到(3R,3aR,5aR,9aR)-7-Methyl-2-oxo-3,3a,4,5,5a,6,9,9a-octahydro-2H-cyclopenta[a]naphthalene-3-carboxylic acid ethyl ester