Imidazolium ylides from a conjugate addition-proton transfer route and their cycloaddition reactions

4,5-Dihydroimidazolium ylides formed by conjugate addition– proton transfer from dihydroimidazoles and doubly-activated electron-deficient alkenes afford 2:1 cycloadducts in a one-pot process wherein the alkene also acts as a dipolarophile.

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