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Enantioselective synthesis of indole-fused dihydropyranones via catalytic cycloaddition of ketenes and 3-alkylenyloxindoles. | LitMetric
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 diastereo- and enantioselectivities.
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