A diastereoselective synthesis of the functionalized trans-anti-hydrophenanthrenes via Ti-mediated reductive radical cyclization has been developed. This method enabled the convergent totalsynthesis of nebularilactone A and the first totalsynthesis of kamebanin via a novel formal semi-pinacol rearrangement reaction and an unprecedented Thorpe-Ziegler-type D-ring formation reaction.
已经开发了通过 Ti 介导的还原自由基环化功能化的反式-反式 -氢菲的非对映选择性合成。该方法通过新的形式半频哪醇重排反应和前所未有的 Thorpe-Ziegler 型 D 环形成反应实现了 nebularilactone A 的收敛全合成和 kamebanin 的首次全合成。
The development and scope of a versatile tandem Stille-oxa-electrocyclization reaction
作者:Uttam K. Tambar、Taichi Kano、John F. Zepernick、Brian M. Stoltz
DOI:10.1016/j.tetlet.2006.11.097
日期:2007.1
A palladium-catalyzed tandem Stille-oxa-electrocyclization reaction has been developed for the convergent preparation of highly substituted polycyclic pyran systems. The strategy presented in this letter is an alternative to the known methods for constructing similar pyran systems. The substrate scope of this diastereoselective transformation is explored. (c) 2006 Elsevier Ltd. All rights reserved.
KIM, TONG HEI;ASAKURA, JUN-ICHI;ASAKA, YUKIHIRO, CHEM. EXPRESS., 5,(1990) N, C. 221-224