Nickel-Catalyzed Phosphine Free Direct N-Alkylation of Amides with Alcohols
作者:Jagadish Das、Debasis Banerjee
DOI:10.1021/acs.joc.7b03215
日期:2018.3.16
Herein, we developed an operational simple, practical, and selective Ni-catalyzed synthesis of secondary amides. Application of renewable alcohols, earth-abundant and nonprecious nickel catalyst facilitates the transformations, releasing water as byproduct. The catalytic system is tolerant to a variety of functional groups including nitrile, allylic ether, and alkene and could be extended to the synthesis
catalyzed N-alkylation of benzamides and sulfonamides with alcohols via borrowing hydrogen catalysis is illustrated. Various primary alcohols, including benzyl, heteroaryl, and aliphatic alcohols, were alkylated in good to excellent yields. To shed light on the mechanistic details, several control studies and deuterium labeling experiments were performed. Mechanisticstudies underpin that the reaction is going
说明了通过借氢催化有效的钌掺杂水滑石催化苯甲酰胺和磺酰胺与醇的 N-烷基化。各种伯醇,包括苄基醇、杂芳基醇和脂肪醇,都以良好的收率进行了烷基化。为了阐明机械细节,进行了几项对照研究和氘标记实验。机理研究表明,该反应是通过借氢途径而不是 S N 1 型机理进行的。该反应可以很容易地扩大规模,而不会对产率产生任何不利影响。该催化剂还能够直接由2-氨基苯甲酰胺和醇合成喹唑啉酮。成功的可回收性和高反应性突出了催化剂的实际适用性。
[EN] PROCESS FOR PRODUCTION OF BIPHENYL DERIVATIVE<br/>[FR] PROCÉDÉ DE FABRICATION D'UN DÉRIVÉ DE BIPHÉNYLE
The invention provides a production method of a biaryltetrazole derivative useful as an intermediate for an angiotensin II receptor antagonist.
The method comprises
reacting an aryltetrazole derivative with a benzene derivative,
deprotecting or reducing the resulting compound
and
halogenating the deprotected or reduced compound.
A heteroditopic NHC and phosphine ligand supported ruthenium(<scp>ii</scp>)-complex: an effective catalyst for the <i>N</i>-alkylation of amides using alcohols
作者:S. N. R. Donthireddy、Vivek Kumar Singh、Arnab Rit
DOI:10.1039/d2cy00544a
日期:——
A ruthenium(II) complex of a chelated heteroditopic N-heterocycliccarbene ligand in combination with a phosphine ligand was uncovered to be a highly effective catalyst for the N-alkylation of diverse amides using readily available primaryalcohols. A wide range of secondary amides was thus obtained in excellent yields (up to 98%) employing a low catalyst (2c) loading of 0.2 mol% and a substoichiometric
发现螯合的杂二位N-杂环卡宾配体与膦配体的钌 ( II ) 配合物是使用现成的伯醇对各种酰胺进行N-烷基化的高效催化剂。因此,使用 0.2 mol% 的低催化剂 ( 2c ) 负载量和亚化学计量量的碱,以优异的产率(高达 98%)获得范围广泛的仲酰胺。1 H NMR 和 ESI - MS 分析支持N-杂环卡宾和磷化氢在催化循环中支持Ru-H物质,包括氘标记实验在内的机理研究表明涉及借氢方案。此外,目前的催化体系还被证明对 4-氨基苯甲酰胺的选择性单烷基化和不对称二烷基化是有效的,这在我们所知的范围内之前尚未研究过。