methyl (4R,5R)-4-((E)-3-benzyl-4-oxopent-2-enoyloxy)-5-methoxy-4,5-dihydrofuran-2-carboxylate 以
甲苯 为溶剂,
反应 3.0h,
以24%的产率得到methyl (2R,2aR,4aS,7aS,7bS)-5-benzyl-2-methoxy-6-methyl-4-oxo-2a,4,4a,7b-tetrahydro-2H-1,3,7-trioxacyclopenta[cd]indene-7a-carboxylate