A newly designed chiral sulfonium allylide, generated in situ from the corresponding sulfonium salt in the presence of KOBu(t), reacted with alpha,beta-unsaturated esters, ketones, amides, and nitriles to afford trans-2-silylvinyl-trans-3-substituted cyclopropyl esters, ketones, amides, and nitriles with outstanding diastereoselectivity and excellent enantioselectivity in good to high yields. A mechanistic rationale is proposed.
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Ye et al. (2002) studied this question.
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