In Situ‐Generated Cu
<sup>I</sup>
Catalytic System for Oxidative
<i>N</i>
‐Formylation of N‐Heterocycles and Acyclic Amines with Methanol
作者:Yujing Zhang、Xingchao Dai、Jixue Wang、Junxi Liang、Jabor Rabeah、Xia Tian、Xiaoqiang Yao、Yanbin Wang、Shaofeng Pang
DOI:10.1002/cssc.202202104
日期:2023.2.8
AbstractThe development of a sustainable and simple catalytic system for N‐formylation of N‐heterocycles with methanol by direct coupling remains a challenge, owing to many competing side reactions, given the sensitivity of N‐heterocycles to many catalytic oxidation or dehydrogenation systems. This work concerns the development of an in situ‐generated CuI catalytic system for oxidative N‐formylation of N‐heterocycles with methanol that is based on the case study of a more typical 1,2,3,4‐tetrahydroquinoline as substrate. Aside from N‐heterocycles, some acyclic amines are also transformed into the corresponding N‐formamides in moderate yields. Furthermore, a probable reaction mechanism and reaction pathway are proposed and extension of work based on some findings leads to a demonstration that the formed ⋅O2− and ⋅OOH radicals in the catalytic system is related to the formation of undesired tar‐like products.
Pd/C-Catalyzed Reductive Formylation of Indoles and Quinolines Using Formic Acid
作者:Béla Török、Aditya Kulkarni、Ryan Gianatassio
DOI:10.1055/s-0030-1259978
日期:2011.4
from the corresponding indoles and quinolines. In the first step, the heterocyclic compounds are reduced to the corresponding dihydro or tetrahydroproducts by a Pd/C-catalyzed transfer hydrogenation using formic acid as a hydrogen donor. In the second step, nitrogen is formylated by formic acid to afford the final products in very good isolated yields. catalytic transfer hydrogenation - indoles - quinolines