Copper-Catalyzed Diastereo- and Enantioselective Desymmetrization of Cyclopropenes: Synthesis of Cyclopropylboronates
作者:Alejandro Parra、Laura Amenós、Manuel Guisán-Ceinos、Aurora López、José Luis García Ruano、Mariola Tortosa
DOI:10.1021/ja510419z
日期:2014.11.12
A novel Cu-catalyzed diastereo- and enantioselective desymmetrization of cyclopropenes to afford nonracemic cyclopropylboronates is described. Trapping the cyclopropylcopper intermediate with electrophilic amines allows for the synthesis of cyclopropylaminoboronic esters and demonstrates the potential of the approach for the synthesis of functionalized cyclopropanes.
描述了一种新型的 Cu 催化的环丙烯的非对映选择性和对映选择性去对称化,以提供非外消旋的环丙基硼酸酯。用亲电胺捕获环丙基铜中间体可以合成环丙基氨基硼酸酯,并展示了该方法合成功能化环丙烷的潜力。
Cobalt‐Catalyzed Diastereo‐ and Enantioselective Hydroalkylation of Cyclopropenes with Cobalt Homoenolates
作者:Wei Huang、Fanke Meng
DOI:10.1002/anie.202012122
日期:2021.2
in situ from ring‐opening of easily accessible cyclopropanols promoted by a chiral phosphine–cobalt complex is presented. Such a process represents the unprecedented and direct introduction of a wide range of functionalized alkylgroups without the need of pre‐formation of stoichiometric amounts of organometallic reagents onto the cyclopropane motif, affording multi‐substituted cyclopropanes in up to 99 %
Enantioselective Desymmetrization of Cyclopropenes by Hydroacylation
作者:Diem H. T. Phan、Kevin G. M. Kou、Vy M. Dong
DOI:10.1021/ja107738a
日期:2010.11.24
We report an enantioselective desymmetrization of cyclopropenes by intermolecular Rh-catalyzed hydroacylation. Cyclopropylketones, bearing quaternary stereocenters, are produced with diastereocontrol (up to >20:1) and excellent enantiomeric excess (up to >99 ee).