Umpolung of the reactivity of allylsilanes. Palladium(II) catalyzed cyclization of allylsilyl alcohols: a new route to substituted 2-vinyltetrahydrofurans
摘要:
Functionalized allylsilanes 1-4 undergo palladium(II) catalyzed ring closure to afford 4- and/or 5-substituted 2-vinyltetrahydrofurans (5-8) under mild conditions. The catalytic reactions proceed through (eta(3)-allyl)palladium intermediates formed by palladadesilylation of the allylsilane substrates. (C) 2000 Elsevier Science Ltd. All rights reserved.