Catalytic N-Alkylation of Amines Using Carboxylic Acids and Molecular Hydrogen
作者:Iván Sorribes、Jose R. Cabrero-Antonino、Cristian Vicent、Kathrin Junge、Matthias Beller
DOI:10.1021/jacs.5b07994
日期:2015.10.28
green N-alkylation of amines has been accomplished by applying readily available carboxylic acids in the presence of molecular hydrogen. Applying an in situ formed ruthenium/triphos complex and an organic acid as cocatalyst, a broad range of alkylated secondary and tertiary amines are obtained in good to excellent yields. This novel method is also successfully applied for the synthesis of unsymmetrically
通过在分子氢存在下应用容易获得的羧酸,已经实现了胺的方便、实用和绿色的 N-烷基化。应用原位形成的钌/三磷配合物和有机酸作为助催化剂,可以以良好到极好的收率获得范围广泛的烷基化仲胺和叔胺。这种新方法还成功地应用于通过相应胺、羧酸和作为 C1 源的 CO2 的直接三组分偶联反应合成不对称取代的 N-甲基/烷基苯胺。
A Selective and General Cobalt‐Catalyzed Hydroaminomethylation of Olefins to Amines
作者:Ji Yang、Fábio G. Delolo、Anke Spannenberg、Ralf Jackstell、Matthias Beller
DOI:10.1002/anie.202112597
日期:2022.1.10
A general and selective synthesis of amines via hydroaminomethylation of olefins in the presence of the specific Co-tert-BuPy-Xantphos catalyst is presented. This novel system is complementary to previously known noble metal catalysts and constitutes one of the most general catalysts for HAM.
介绍了在特定的 Co- tert -BuPy-Xantphos 催化剂存在下通过烯烃的氢氨基甲基化合成胺的一般选择性合成方法。这种新系统是对以前已知的贵金属催化剂的补充,是最常见的 HAM 催化剂之一。
Coordination assembly enables highly selective catalytic hydroaminomethylation of olefins
作者:Chun Qian、Qingshu Zheng、Jie Chen、Bo Tu、Tao Tu
DOI:10.1039/d2gc04195b
日期:——
produce amines, but control of the selectivity between linear and branched products is still challenging. Herein, a series of solid main-chain NHC–rhodium(I) polymers prepared by coordination assembly were found to be highly efficient single-site catalysts in the HAM of olefins. A dramatic enhancement of both productivity (up to 98% yield) and linear selectivity (up to 99 : 1) was observed, largely
烯烃的加氢氨甲基化 (HAM) 是生产胺类最有前途和最实用的方法之一,但控制线性和支化产物之间的选择性仍然具有挑战性。在此,发现一系列通过配位组装制备的固体主链 NHC-铑 ( I ) 聚合物是烯烃 HAM 中的高效单中心催化剂。观察到生产率(高达 98% 的收率)和线性选择性(高达 99:1)的显着提高,这主要是由于固体催化剂的扩展配位组装结构所施加的限制。除了广泛的底物范围外,创纪录的营业额为 2.1 × 10 5实现了,固体催化剂可以重复使用18次以上,活性和选择性没有明显损失。该协议对敏感官能团具有很高的容忍度,其实用性体现在直接从烯丙醇或杂环胺合成几种领先的药物,无需任何保护或脱保护操作,规模可达一克。
Hydroaminoalkylation of sterically hindered alkenes with <i>N</i>,<i>N</i>-dimethyl anilines using a scandium catalyst
作者:Jianhong Su、Yiqun Zhou、Xin Xu
DOI:10.1039/c8ob02657b
日期:——
An atom- and step-economical C(sp3)–H addition of N,N-dimethyl anilines to various sterically demanding 1,1- and 1,2-disubstituted alkenes has been achieved by using a simple β-diketiminato ligand supported scandium dialkyl complex in combination with a borate compound. The corresponding C(sp3)–C(sp3) bond forming reaction occurs with excellent regioselectivities to give a variety of tertiary aromatic