Copper-catalyzed oxidative amidation between aldehydes and arylamines under mild conditions
作者:Yongzheng Ding、Xian Zhang、Dongyang Zhang、Yuting Chen、Zhibing Wu、Peiyi Wang、Wei Xue、Baoan Song、Song Yang
DOI:10.1016/j.tetlet.2014.12.113
日期:2015.2
amide compounds, including heterocyclic amide compounds, were obtained with moderate to good yields ranging from 31–88% by using copper iodide (CuI) to catalyze the oxidative amidation between aldehydes and amines under solvent-free conditions at room temperature in air.
A simple and highlyefficient protocol was developed for the transamidation of N,N‐disubstituted amides with primary amines in the presence of potassiumtert‐butoxide, affording desired products in good to excellent yields. Experimental investigation revealed that an unprecedented coordinationradical process enhanced this transformation.
Enantioselective, Copper-Catalyzed Alkynylation of Ketimines To Deliver Isoquinolines with α-Diaryl Tetrasubstituted Stereocenters
作者:Srimoyee Dasgupta、Jixin Liu、Clarissa A. Shoffler、Glenn P. A. Yap、Mary P. Watson
DOI:10.1021/acs.orglett.6b02787
日期:2016.12.2
An enantioselective, copper-catalyzedalkynylation of cyclic α,α-diaryl ketiminium ions has been developed to deliver isoquinoline products with diaryl, tetrasubstituted stereocenters. The success of this reaction relied on identification of Ph-PyBox as the optimal ligand, i-Pr2NEt as the base, and CHCl3 as the solvent. A broad scope and functional group tolerance were observed. Notably, the use of
Diprotonative stabilization of ring-opened carbocationic intermediates: conversion of tetrahydroisoquinoline to triarylmethanes
作者:Hiroaki Kurouchi
DOI:10.1039/d0cc01969k
日期:——
Superacid-promoted conversion of tetrahydroisoquinolines to triarylmethanes via tandem reactions of C–N bond scission, Friedel–Crafts alkylation, C–O bond scission, and electrophilic aromatic amidation was developed. Dication formation was important for stabilizing the ring-opened carbocationic intermediate, which is a new role for diprotonation in reaction mechanisms.
The photoredox/Ni dual catalysis is an appealing strategy to enable unconventional C–heteroatom bondformation. While significant advances have been achieved using this system, intermolecular C(sp3)–N bondformation has been relatively underdeveloped due to the difficulty in C(sp3)–N reductive elimination. Herein, we present a new mechanistic approach that utilizes dioxazolones as the Ni(II)-nitrenoid