Electrocatalytic Asymmetric Nozaki–Hiyama–Kishi Decarboxylative Coupling: Scope, Applications, and Mechanism
作者:Yang Gao、Baiyang Jiang、Nathan C. Friede、Arianne C. Hunter、Dylan G. Boucher、Shelley D. Minteer、Matthew S. Sigman、Sarah E. Reisman、Phil S. Baran
DOI:10.1021/jacs.3c13442
日期:2024.2.21
reactions are disclosed herein by employing a Cr-electrocatalytic decarboxylative approach. Using easily accessible aliphatic carboxylic acids (via redox-active esters) as alkyl nucleophile synthons, in combination with aldehydes and enabling additives, chiral secondary alcohols are produced in a good yield with high enantioselectivity under mild reductive electrolysis. This reaction, which cannot be mimicked
本文通过采用 Cr-电催化脱羧方法公开了第一个通用的对映选择性烷基-Nozaki-Hiyama-Kishi (NHK) 偶联反应。使用易于获得的脂肪族羧酸(通过氧化还原活性酯)作为烷基亲核合成子,与醛和辅助添加剂相结合,在温和的还原电解下以良好的收率和高对映选择性生产手性仲醇。该反应无法使用化学计量的金属或有机还原剂来模拟,可耐受多种官能团,并成功应用于显着简化多种医学相关结构和天然产物的合成。机理研究表明,这种不对称烷基 e-NHK 反应是通过使用催化四(二甲氨基)乙烯来实现的,四(二甲氨基)乙烯充当关键的还原介体,介导 Cr III /手性配体复合物的电还原。
Catalytic asymmetric induction Part 2. Chiral tricarbonyl (η6 arene) chromium (0) complexes as enantioselective catalysts
作者:Graham B. Jones、Steven B. Heaton
DOI:10.1016/s0957-4166(00)82346-0
日期:1993.2
A chiral metallocyclic Lewis acid based catalyst system derived from norephedrine is reported. A key stereodirective element emanates from a tricarbonyl chromium (0) group complexed to the aryl ring. The catalysts mediate the addition of dialkyl zinc species to a variety of aldehydes with high enantioselectivity.
Catalytic Asymmetric Alkylation of Aldehydes with Grignard Reagents
作者:Yusuke Muramatsu、Toshiro Harada
DOI:10.1002/anie.200704963
日期:2008.1.25
Catalytic asymmetric addition of aldehydes using organolithium reagents in the presence of commercial available chiral diol ligands
作者:Hua Zong、Huayin Huang、Ling Song
DOI:10.1016/j.tetasy.2016.08.016
日期:2016.11
An efficient method for the catalytic asymmetric additions to aldehydes using organolithium reagents and titanium(IV) isopropoxide in the presence of commercially available and relatively inexpensive diol ligands, such as (S)-BINOL or D-TADDOL has been developed. Good to excellent yields (up to 92%) and enantioselectivities (up to 94%) of the corresponding secondary alcohol products can be obtained following a simple procedure at relatively mild reaction temperatures. (C) 2016 Published by Elsevier
Stereospecific Nickel-Catalyzed Borylation of Secondary Benzyl Pivalates
A stereoselective nickel-catalyzed direct borylation of enantioenriched secondary benzyl pivalates is described. This methodology is characterized by an intriguing cooperativity of simple nickel and copper salts to promote the targeted C–B bond formation under mild reaction conditions. Unlike classical SN2-type processes, this protocol occurs with a neat retention of configuration, resulting in synthetically