"One-Pot" Access to 4H-Chromenes with Formation of a Chiral Quaternary Stereogenic Center by a Highly Enantioselective Iminium-allenamine Involved Oxa-Michael-Aldol Cascade

[摘要]：An unprecedented organocatalytic highly enantioselective cascade Michael aldol reaction has been developed in high yields under mild reaction conditions. The "one-pot" process affords an efficient approach to the synthetically and biologically important chiral 4H-chromenes bearing a quaternary stereogenic center. The study significantly expands the scope of less explored organocatalytic iminium-allenamine chemistry.

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