A new cycloadduct: The title reaction of methylene-trimethylenemethane (TMM) with α,β-unsaturated N-acyl pyrroles is an efficient method for the construction of vinylidenecyclopentanes. An asymmetric protocol using this unique donor forms cycloadducts in excellent yield and enantioselectivity, making use of a bisdiamidophosphite ligand derived from trans-1,2-stilbenediamine.
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Trost et al. (2013) studied this question.
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