N-Heterocyclic Carbene (NHC)-Catalyzed Highly Diastereo- and Enantioselective Oxo-Diels-Alder Reactions for Synthesis of Fused Pyrano[2,3-b]indoles

[摘要]：A chiral N-heterocyclic carbene (NHC)-catalyzed Diels-Alder reaction of 2-oxoindolin-3-ylidenes and alpha-chloroaldehydes was developed for the synthesis of fused pyrano[2,3-b]indoles in good to excellent yields (up to 99%) with high cis-diastereoselectivities (>99:1 dr) and enantioselectivities (up to >99% ee).

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