PCl<sub>3</sub>-mediated transesterification and aminolysis of <i>tert</i>-butyl esters via acid chloride formation
作者:Xiaofang Wu、Lei Zhou、Fangshao Li、Jing Xiao
DOI:10.1177/1747519820987530
日期:2021.5
A PCl3-mediated conversion of tert-butyl esters into esters and amides in one-pot under air is developed. This novel protocol is highlighted by the synthesis of skeletons of bioactive molecules and gram-scale reactions. Mechanistic studies revealed that this transformation involves the formation of an acid chloride in situ, which is followed by reactions with alcohols or amines to afford the desired
<i>cis</i>-Specific Hydrofluorination of Alkenylarenes under Palladium Catalysis through an Ionic Pathway
作者:Enrico Emer、Lukas Pfeifer、John M. Brown、Véronique Gouverneur
DOI:10.1002/anie.201310056
日期:2014.4.14
paper describes the hydrofluorination of alkenes through sequential H− and F+ addition underpalladiumcatalysis. The reaction is cis specific, thus providing access to benzylic fluorides. The mechanism of this reaction involves an ionicpathway and is distinct from known hydrofluorinations involving radical intermediates. The first catalytic enantioselective hydrofluorination is also disclosed.
Deprotonative directed ortho cupration of aromatic/heteroaromatic C-H bond and subsequent oxidation with t-BuOOH furnished functionalized phenols in high yields with high regio- and chemoselectivity. DFT calculations revealed that this hydroxylation reaction proceeds via a copper (I → III → I) redox mechanism. Application of this reaction to aromatic C-H amination using BnONH2 efficiently afforded
芳族/杂芳族 CH 键的去质子定向邻铜化和随后用 t-BuOOH 氧化以高产率和高区域选择性和化学选择性提供官能化酚。DFT 计算表明,这种羟基化反应是通过铜 (I → III → I) 氧化还原机制进行的。将该反应应用于使用 BnONH2 的芳族 CH 胺化有效地提供了相应的伯苯胺。这些反应显示出广泛的范围和良好的官能团兼容性。还展示了这些转化的催化版本。
Late-Stage Photoredox C–H Amidation of N-Unprotected Indole Derivatives: Access to <i>N</i>-(Indol-2-yl)amides
carboxamides are valuable in pharmaceutical applications, the preparation N-(indol-2-yl)amides with similar structures continues to be challenging. Herein we report on visible-light-induced late-stage photoredox C–H amidation with N-unprotected indoles and tryptophan-containing peptides, leading to the formation of N-(indol-2-yl)amide derivatives. N-Unprotected indoles and aryloxyamides that contain an electron-withdrawing
Rhodium-Catalyzed Hydrocarboxylation of Olefins with Carbon Dioxide
作者:Shingo Kawashima、Kohsuke Aikawa、Koichi Mikami
DOI:10.1002/ejoc.201600338
日期:2016.7
excellent yields. In this catalytic process with carbon dioxide, intervention of the RhI–H species, which could be generated from the RhI catalyst and diethylzinc, was clarified. Significantly, the catalyticasymmetric hydrocarboxylation of α,β-unsaturated esters with carbon dioxide was also performed by employing a cationic rhodium complex possessing (S)-(–)-4,4′-bi-1,3-benzodioxole-5,5′-diylbis(diphenylphosphine)