(3aR)-8t-acetoxy-5,8a-dimethyl-3-methylene-(3ar,8at,9ac)-3a,4,6,7,8,8a,9,9a-octahydro-3H-naphtho[2,3-b]furan-2-one 、
重氮甲烷 生成 [(3aR,8R,8aR,9aR)-5,8a-dimethyl-3-methylidene-2-oxo-4,6,7,8,9,9a-hexahydro-3aH-benzo[f][1]benzofuran-8-yl] acetate;diazomethane