methyl 3-cyano-7-methoxy-1-oxo-1,3-dihydroisobenzofuran-5-carboxylate 、
4a-Methoxy-7-methyl-5,6,7,8-tetrahydronaphthalen-2-one 在
lithium tert-butoxide 作用下,
以
四氢呋喃 为溶剂,
以71%的产率得到methyl 6-hydroxy-8-methoxy-3-methyl-7,12-dioxo-1,2,3,4,7,12-hexahydrobenz[a]anthracene-10-carboxylate