The preparation of α-alkylidene-γ-butyrolactones using a telescoped intramolecular Michael/olefination (TIMO) sequence:: Synthesis of (+)-paeonilactone B

被引:29
|
作者
Edwards, Michael G. [1 ]
Kenworthy, Martin N. [1 ]
Kitson, Russell R. A. [1 ]
Perry, Alexis [1 ]
Scott, Mark S. [1 ]
Whitwood, Adrian C. [1 ]
Taylor, Richard J. K. [1 ]
机构
[1] Univ York, Dept Chem, York YO10 5DD, N Yorkshire, England
基金
英国工程与自然科学研究理事会;
关键词
tandem reactions; phosphonates; Michael addition; Horner-Wadsworth-Emmons; lactones;
D O I
10.1002/ejoc.200800558
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
A novel telescoped intramolecular Michael addition/proton transfer/HWE olefination sequence has been developed to provide rapid access to alpha-alkylidene-gamma-butyrolactones. This methodology has been applied to prepare a range of tetrahydrobenzofuran-2,5-diones, and related systems, and also utilised in an extremely short synthesis of the natural product (+)-paeonilactone B in enantiomerically pure form. In addition, preliminary experiments are described that illustrate a palladium-catalysed variant proceeding by way of a pi-allyl intermediate. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008).
引用
收藏
页码:4769 / 4783
页数:15
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