Enantioselective Copper-Mediated Allylic Substitution with Grignard Reagents Employing a Chiral Reagent-Directing Leaving Group
作者:Bernhard Breit、Daniel Breuninger
DOI:10.1055/s-2004-831247
日期:——
Enantioselective copper-mediated allylic substitution with Grignard reagents was achieved employing the ortho-diphenylphosphanylferrocene carboxylate (o-DPPF) system as a planar chiral reagent-directing leaving group. Careful optimization of reaction parameters resulted in excellent regioselectivities and enantioselectivies of up to 95% ee.
利用邻二苯基膦酰二茂铁羧酸酯(邻DPPF)体系作为平面手性试剂导向离去基团,实现了铜介导的烯丙基取代格氏试剂的对映体选择性。通过对反应参数的精心优化,获得了极佳的区域选择性和高达 95% ee 的对映选择性。
FRANKS S.; HARTLEY F. R., J. CHEM. SOC. PERKIN TRANS., 1980, PART 1, NO 10, 2233-2237
作者:FRANKS S.、 HARTLEY F. R.
DOI:——
日期:——
Catalyst-controlled reverse selectivity in C–C bond formation: NHC-Cu-catalyzed α-selective allylic alkylation with organolithium reagents
作者:Stefano F. Pizzolato、Massimo Giannerini、Pieter H. Bos、Martín Fañanás-Mastral、Ben L. Feringa
DOI:10.1039/c5cc01521a
日期:——
An efficient and highly [small alpha]-selective copper-catalyzed allylic alkylation of allylic halides with organolithium reagents is presented. The use of N-heterocyclic carbenes as ligands is key to reverse the common [small alpha]-selectivity...