1,1,3,3-Tetrakis(trifluoromethanesulfonyl)propane was found as an excellent Brønsted acid catalyst for the Mukaiyama-Michael reaction of alpha,beta-enones with 2-silyloxyfurans; using beta,beta-disubstituted enones as a Michael acceptor, an excellent yield construction of quaternary carbon centers could be achieved; in addition, very low catalyst loading of Brønsted acid was used in a range from 0.05 to 1.0 mol%.
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Takahashi et al. (2008) studied this question.
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