More functionality possible: The conjugate addition of ethyl propiolate to Meldrum's acid derived acceptors is described. These reactions proceed under mild conditions employing substoichiometric amounts of a copper(I) species generated in situ. When chiral acceptors are employed as substrates, the additions are stereoselective and provide the addition adduct with high diastereoselectivity.
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Fujimori et al. (2007) studied this question.
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