The enantioselective intermolecular [2 + 2 + 2] cycloaddition reaction of two molecules of isocyanate and one molecule of allene is catalyzed by a nickel(0)/(S,S)-i-Pr-FOXAP complex, providing an efficient access to enantiomerically enriched dihydropyrimidine-2,4-diones.
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Miura et al. (2010) studied this question.
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