<i>trans</i>-Directing Ability of the Amide Group: Enabling the Enantiocontrol in the Synthesis of 1,1-Dicarboxy Cyclopropanes. Reaction Development, Scope, and Synthetic Applications
作者:David Marcoux、Sébastien R. Goudreau、André B. Charette
DOI:10.1021/jo902066y
日期:2009.12.4
enantioselective formation of 1,1-cyclopropane diesters via the metal-catalyzed cyclopropanation of olefins. The strategies envisioned to achieve such a goal are discussed as well as the results that led us to the discovery of the powerful trans-directing ability of the amide group in Rh(II)-catalyzed cyclopropanation reactions. We show how this feature enables a solution for the stereoselective synthesis
在本文中,我们描述了通过金属催化的烯烃环丙烷化对1,1-环丙烷二酯对映选择性形成的努力。讨论了为实现这一目标而设想的策略,以及导致我们发现功能强大的跨平台交易的结果。Rh(II)催化的环丙烷化反应中酰胺基的定向能力。我们展示了此功能如何实现1,1-二羧基环丙烷衍生物的立体选择性合成的解决方案。讨论了范围和局限性,并论证了这些新形成的环丙烷显示出与1,1-环丙烷二酯相似的反应性。相反,可以从市售烯烃中分两步获得1,1-环丙烷二酯。该方法的潜在效用通过数个官能团转化及其在(S)-(+)-姜黄素,(S)-(+)-核苷,(S)-(+)-核苷醇,(+)-七茂烯,(±)-黄根醇和(±)-2-羟基cal烯。