Abstract
A rational designed tandem reaction of 2-(1-alkynyl)-2-alken-1-ones with 3-aminobenzofurans enabled by a chiral bifunctional catalyst is described, affording biologically significant polycyclic 1,4-dihydropyridines in moderate to good yields (43-82%) with good to excellent enantioselectivities (83-99%). This formal [3 + 3] annulation reaction reveals good practicality when conducted on a gram scale, and the cycloadduct has the capability for further elaborations.
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