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.
A Mild and Efficient Method for the Stereoselective Formation of C−O Bonds: Palladium-Catalyzed Allylic Etherification Using Zinc(II) Alkoxides
作者:Hahn Kim、Chulbom Lee
DOI:10.1021/ol027104u
日期:2002.11.1
[reaction: see text] A highly chemo- and stereoselective palladium-catalyzed allylic etherification reaction is described. The use of zinc(II) alkoxides proved effective in promoting the addition of the oxygen nucleophile derived from aliphatic alcohols to eta(3)-allylpalladium complexes. Using diethylzinc (0.5 equiv), 5 mol % of Pd(OAc)(2), and 7.5 mol % of 2-di(tert-butyl)phosphinobiphenyl in THF
Umpolung of the reactivity of allylsilanes. Palladium(II) catalyzed cyclization of allylsilyl alcohols: a new route to substituted 2-vinyltetrahydrofurans
作者:István Macsári、Kálmán J. Szabó
DOI:10.1016/s0040-4039(99)02245-5
日期:2000.2
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.