Hydrophosphination of CO<sub>2</sub>and Subsequent Formate Transfer in the 1,3,2-Diazaphospholene-Catalyzed<i>N</i>-Formylation of Amines
作者:Che Chang Chong、Rei Kinjo
DOI:10.1002/anie.201505244
日期:2015.10.5
Hydrophosphination of CO2 with 1,3,2‐Diazaphospholene (NHP‐H; 1) afforded phosphorus formate (NHP‐OCOH; 2) through the formation of a bond between the electrophilic phosphorus atom in 1 and the oxygen atom from CO2, along with hydride transfer to the carbon atom of CO2. Transfer of the formate from 2 to Ph2SiH2 produced Ph2Si(OCHO)2 (3) in a reaction that could be carried out in a catalytic manner
Zinc Powder Catalysed Formylation and Urealation of Amines Using
<scp>
CO
<sub>2</sub>
</scp>
as a
<scp>C1</scp>
Building Block
<sup>†</sup>
作者:Chongyang Du、Yaofeng Chen
DOI:10.1002/cjoc.202000072
日期:2020.10
valuable organiccompounds catalysed by cheap and biocompatible metal catalysts is one of important topics of current organic synthesis and catalysis. Herein, we report the zinc powder catalysed formylation and urealation of amines with CO2 and (EtO)3SiH under solvent free condition. Using 2 mol% zinc powder as the catalyst, a series of secondary amines, both the aromatic ones and the aliphatic ones,
CO2 as a C1-building block for the catalytic methylation of amines
作者:Olivier Jacquet、Xavier Frogneux、Christophe Das Neves Gomes、Thibault Cantat
DOI:10.1039/c3sc22240c
日期:——
A novel catalytic reaction has been designed to utilize, for the first time, CO2 as a C1 feedstock in the synthesis of N-methylamines. Simple zinc catalysts, based on commercially available zinc salts and ligands, prove highly efficient in promoting both a 6 electron reduction of carbon dioxide and the formation of a C–N bond, using hydrosilanes and amines.
A substituent- and temperature-controllable NHC-derived zwitterionic catalyst enables CO<sub>2</sub> upgrading for high-efficiency construction of formamides and benzimidazoles
作者:Zhaozhuo Yu、Zhengyi Li、Lilong Zhang、Kaixun Zhu、Hongguo Wu、Hu Li、Song Yang
DOI:10.1039/d1gc01897c
日期:——
zwitterionic catalyst for efficient CO2 reductive upgrading via either N-formylation or further coupling with cyclization under mild conditions (25 °C, 1 atm CO2) using hydrosilane as a hydrogen source. More than 30 different alkyl and aromatic amines could be transformed into the corresponding formamides or benzimidazoles with remarkable yields (74%–98%). The electronic effect of the introduced substituent
近年来,将温室气体CO 2化学催化升级为有价值的化学品和生物燃料引起了广泛关注。在已报道的方法中,CO 2与胺的N-甲酰化由于其在构建含N 线性和环状骨架方面的多功能性而具有重要意义。这里,稳定的N-杂环卡宾-羧基加合物(NHC-CO 2)中制备的轻便和可作为用于高效CO可回收两性离子催化剂2还原升级经由任一Ñ -formylation或另外的耦合用温和的条件下环化(25 °C, 1 atm CO 2) 使用氢硅烷作为氢源。超过 30 种不同的烷基和芳香胺可以转化为相应的甲酰胺或苯并咪唑,产率显着(74%–98%)。发现引入的取代基对NHC-CO 2的电子效应明显影响两性离子催化剂的热稳定性和亲核性,这与其催化活性直接相关。此外,NHC-CO 2可以通过在特定温度下原位脱羧来提供CO 2,这取决于引入的取代基类型。实验和计算研究表明,NHC-CO 2上的羧基物质不仅是亲核中心,而且还是在氢化硅烷化过程中快速捕获或替代环境
Electrostatic Catalyst Generated from Diazadiborinine for Carbonyl Reduction
hydroboration reactions of carbonyl compounds and CO2 catalyzed by aromatic diazadiborinine. A joint experimental and computational study on the reaction mechanism suggests that adducts of diazadiborinine with carbonyl and CO2 formed at the initial stage of the reactions serve as actual catalysts. The former stabilizes the transition state by using the electrostatic interaction between the hydride of