(E)-1-phenylhex-4-ene-1,3-dione 、
(4aR,6S,8aR)-methyl 6-(benzyloxy)-5,5,8a-trimethyl-3-oxo-3,4,4a,5,6,7,8,8a-octahydronaphthalene-2-carboxylate 在
caesium carbonate 作用下,
以
乙酸乙酯 为溶剂,
反应 24.0h,
以62%的产率得到(2S,4aS,8S,8aR,10aR)-methyl 2-(benzyloxy)-1,1,4a,8-tetramethyl-6,9-dioxo-1,2,3,4,4a,6,7,8,8a,9,10,10a-dodecahydrophenanthrene-8a-carboxylate