methyl (2S,4aR,6aR,7R,9S,10aS,10bR)-9-acetyloxy-2-(hydroxymethyl)-6a,10b-dimethyl-4,10-dioxo-2,4a,5,6,7,8,9,10a-octahydro-1H-benzo[f]isochromene-7-carboxylate 、
碘乙烷 在
silver(l) oxide 作用下,
以
乙腈 为溶剂,
以12%的产率得到(2S,4aR,6aR,7R,9S,10aS,10bR)-methyl 9-acetoxy-2-(ethoxymethyl)-6a,10b-dimethyl-4,10-dioxododecahydro-1H-benzo[f]isochromene-7-carboxylate