Borrowing hydrogen: Indirect "Wittig" olerination for the formation of C-C bonds from alcohols

被引：68

作者：

Black, Phillip J. ^{[1
]}

Edwards, Michael G. ^{[1
]}

Williams, Jonathan M. J. ^{[1
]}

机构：

[1] Univ Bath, Dept Chem, Bath BA2 7AY, Avon, England

来源：

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY | 2006年 / 2006卷 / 19期

关键词：

domino reactions; dehydrogenation; iridium; transfer hydrogenation; Wittig reactions;

D O I：

10.1002/ejoc.200600070

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

The successful development of an indirect three-step domino sequence for the formation of C-C bonds from alcohol substrates is described. An iridium-catalysed dehydrogenation of alcohol I affords the intermediate aldehyde 2. The desired C-C bond can then be formed by a facile Wittig olefination, yielding the intermediate alkene 3. In the final step the alkene is hydrogenated to afford the indirect Wittig product, the alkane 4. The key to this process is the concept of borrowing hydrogen; hydrogen removed in the initial dehydrogenation step is simply borrowed by the iridium catalyst. Functioning as a hydrogen reservoir, the catalyst facilitates C-C bond formation before subsequently returning the borrowed hydrogen in the final step. Herein we present full details of our examination into both the substrate and reaction scope and the limitations of the catalytic cycle. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006).

引用

页码：4367 / 4378

页数：12

共 69 条

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