[3+2] Cycloadditions of vinylidenecyclopropanes (VDCPs) with electron-deficient olefins, such as methyl vinyl ketone (MVK) and acrylaldehyde, proceed smoothly in the presence of a catalytic amount of triflic imide (Tf(2)NH) to give the corresponding functionalized cyclopentanes in good to high yields.
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Li et al. (2008) studied this question.
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