Chiral N‐heterocyclic carbenes were found to be efficient catalysts for the formal [4+2] cycloaddition reaction of alky(aryl)ketenes and o‐quinone methides to give the corresponding 3,3,4‐trisubstituted 3,4‐dihydrocoumarins in good yields with good diastereoselectivities and excellent enantioselectivities.
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Lv et al. (2009) studied this question.
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