methyl (4R,5R)-5-methoxy-4-((E)-4-oxo-4-phenylbut-2-enoyloxy)-4,5-dihydrofuran-2-carboxylate 以
邻二甲苯 为溶剂,
反应 5.0h,
以72.9%的产率得到methyl (2R,2aR,4aR,7aS,7bS)-2-methoxy-4-oxo-6-phenyl-2a,4,4a,7b-tetrahydro-2H-1,3,7-trioxacyclopenta[cd]indene-7a-carboxylate