Applications of C–H Functionalization Logic to Cyclobutane Synthesis
作者:Will R. Gutekunst、Phil S. Baran
DOI:10.1021/jo4027148
日期:2014.3.21
The application of C-H functionalization logic to target-oriented synthesis provides an exciting new venue for the development of new and useful strategies in organic chemistry. In this article, C-H functionalization reactions are explored as an alternative approach to access pseudodimeric cyclobutane natural products, such as the dictazole and the piperarborenine families. The use of these strategies in a variety of complex settings highlights the subtle geometric, steric, and electronic effects at play in the auxiliary guided C-H fimctionalization of cyclobutanes.
Sequential C sp 3H Arylation and Olefination: Total Synthesis of the Proposed Structure of Pipercyclobutanamide A
作者:Will R. Gutekunst、Ryan Gianatassio、Phil S. Baran
DOI:10.1002/anie.201203897
日期:2012.7.23
square: A strategy for assembling tetrasubstituted cyclobutanes is reported in the context of a short, protecting‐group‐free synthesis of the proposedstructure of pipercyclobutanamide A. The route features sequentialCH functionalizations on an unactivated cyclobutane wherein CC bonds to aryl and styryl groups are made one by one in a stereocontrolled fashion. DG=directing group.
Hip to be square:在一个短的、无保护基团合成哌环丁酰胺 A 结构的背景下,报道了一种组装四取代环丁烷的策略。该路线的特点是在未活化的环丁烷上连续 C H 官能化,其中 C C与芳基和苯乙烯基的键以立体控制的方式一个接一个地形成。DG=指导组。
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