The pinene path to taxol: Readily accessible a-ring building blocks based on novel alkyl- and alkenyllithium reagents with internal carbonyl groups
作者:Paul A. Wender、Ludger A. Wessjohann、Bernd Peschke、David B. Rawlins
DOI:10.1016/0040-4039(95)01491-y
日期:1995.10
The synthesis and chemistry of the novel reagents and stereochemically defined taxane A-ring building blocks 7e–9e are described, providing the basis for the solution to problems previously encountered in the development of syntheses of taxol and its analogs based on pinene.
The acid chloride 6 provides access to 7 (R,S and S,S) which upon bromine-lithium exchange undergoes remarkably highly diastereoselective additions to aldehydes; 7 is also readily elaborated into the acetal 10. Copyright (C) 1996 Elsevier Science Ltd