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The Ficini [2 + 2] cycloaddition using N-sulfonyl-substituted ynamides is described, featuring the utility of CuCl(2) and AgSbF(6) as catalysts. This work represents the first successful example of ynamides participating in a thermal [2 + 2] cycloaddition with enones.
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Li et al. (2010) studied this question.
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