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Cyclization of the alkadienyl carbamates 1 to the cis-divinylcyclopentanes 2 with high enantioselectivity and diastereoselectivity has been successfully achieved by (−)-sparteine-induced asymmetric deprotonation. The conversion may be described as a hybrid of a lithium–ene reaction and an Sn′ reaction.
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Deiters et al. (1999) studied this question.
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