Enantioselective Synthesis of Indole-Fused Dihydropyranones via Catalytic Cycloaddition of Ketenes and 3-Alkcylenylosindoles

[摘要]：Chiral N-heterocyclic carbenes were found to be efficient catalysts for the formal [4+2] cycloaddition reaction of alkyl(aryl)ketenes and 3-alkylenyloxindoles to give the corresponding 3 4-dihydropyrano[2,3-b]indol-2-ones in excellent yields with good diastero- and enantioselectivites in excellent

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