Stereoselective Preparation of Cyclobutanes with Four Different Substituents: Total Synthesis and Structural Revision of Pipercyclobutanamide A and Piperchabamide G
作者:Renhe Liu、Min Zhang、Thomas P. Wyche、Gabrielle N. Winston-McPherson、Tim S. Bugni、Weiping Tang
DOI:10.1002/anie.201203379
日期:2012.7.23
Squared away: A general strategy was developed for the diastereo‐ and enantioselective synthesis of cyclobutanes having four different substituents (see scheme). The strategy involves a RhII‐catalyzed cyclopropanation, a AgI‐catalyzed regioselective and stereospecific ring expansion, and a RhI‐catalyzed addition reaction. The structures of pipercyclobutanamide A and piperchabamide G were synthesized
平方:开发了具有四个不同取代基的环丁烷的非对映和对映选择性合成的通用策略(参见方案)。该策略涉及 Rh II催化的环丙烷化反应、Ag I催化的区域选择性和立体特异性扩环反应以及 Rh I催化的加成反应。合成并修改了哌环丁酰胺A和哌甲酰胺G的结构。