The Preparation of α-Alkylidene-γ-Butyrolactones Using a Telescoped Intramolecular Michael/Olefination (TIMO) Sequence: Synthesis of (+)-Paeonilactone B
作者:Michael G. Edwards、Martin N. Kenworthy、Russell R. A. Kitson、Alexis Perry、Mark S. Scott、Adrian C. Whitwood、Richard J. K. Taylor
DOI:10.1002/ejoc.200800558
日期:2008.10
A novel telescoped intramolecular Michael addition/proton transfer/HWE olefination sequence has been developed to provide rapid access to α-alkylidene-γ-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
一种新型的分子内迈克尔加成/质子转移/HWE烯化序列已被开发出来,可以快速获得α-亚烷基-γ-丁内酯。这种方法已被应用于制备一系列四氢苯并呋喃-2,5-二酮和相关系统,并且还用于以对映体纯形式合成极短的天然产物 (+)-芍药内酯 B。此外,描述了通过 π-烯丙基中间体进行的钯催化变体的初步实验。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)