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Copper-Catalyzed Ficini [2 + 2] Cycloaddition of Ynamides

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posted on 2010-09-03, 00:00 authored by Hongyan Li, Richard P. Hsung, Kyle A. DeKorver, Yonggang Wei
The Ficini [2 + 2] cycloaddition using N-sulfonyl-substituted ynamides is described, featuring the utility of CuCl2 and AgSbF6 as catalysts. This work represents the first successful example of ynamides participating in a thermal [2 + 2] cycloaddition with enones.