Cyclialkylations of conjugated dienones with furans
作者:George Majetich、Yong Zhang、Shuang Liu
DOI:10.1016/s0040-4039(00)73274-6
日期:1994.7
Fused tricyclic compounds with the salient features of the guaianolides and the pseudoguaianolides were prepared using a furan-based cyclialkylation strategy.
The first synthesis of (−)-spongianolide A (1), a cytotoxic sesterterpenoid, and determination of its absolute structure are described. In this synthesis, a simple and practical method for preparation of enantiomerically pure bicyclic and tricyclic β-ketoesters, and a new Wittig reagent, furanmethylide, were developed.
New Wittig reagents, furanmethylids b-e were successfully developed. Their preparation, reactivity, and application toward the natural products synthesis are described in detail. (C) 2003 Elsevier Science Ltd. All rights reserved.