Palladium-Catalyzed Asymmetric Intramolecular Dearomative Heck Reaction of Pyrrole Derivatives
作者:Ping Yang、Shu-Li You
DOI:10.1021/acs.orglett.8b03425
日期:2018.12.7
The Pd-catalyzed asymmetric intramolecular dearomatization of pyrroles via the Heck reaction in the presence of commercially available Pd(OAc)2 and the Feringa ligand is described. Diverse pyrroline derivatives were obtained in excellent yields (up to 99%) with high enantioselectivity (up to 96% ee). The reaction features a wide substrate scope, relatively mild conditions, and useful transformations
A practical synthesis of quinazolinones via intermolecular cyclization between 2-halobenzamides and benzylamines catalyzed by copper(I) immobilized on MCM-41
作者:Nan Yan、Chongren You、Mingzhong Cai
DOI:10.1016/j.jorganchem.2019.07.003
日期:2019.10
using an MCM-41-immobilized l-proline copper(I) complex [MCM-41-l-Proline-CuBr] as the catalyst and air as the oxidant, yielding a variety of quinazolinone derivatives in good yields. The new MCM-41-l-Proline-CuBr catalyst can easily be prepared from commercially readily available and inexpensive reagents and recovered by filtration of the reaction mixture, and reused up to seven times with almost consistent
Copper-Catalyzed Domino Synthesis of Quinazolinones via Ullmann-Type Coupling and Aerobic Oxidative C−H Amidation
作者:Wei Xu、Yibao Jin、Hongxia Liu、Yuyang Jiang、and Hua Fu
DOI:10.1021/ol1030266
日期:2011.3.18
starting materials as well as economical and environmentally friendly air as the oxidant. This can be the first example of constructing N-heterocycles via sequential Ullmann-type coupling under air and aerobicoxidative C−H amidation.
An efficient copper-catalyzed reaction for the synthesis of benzisothiazol-3(2H)-ones has been developed, starting from easily available 2-halobenzamides and carbondisulfide, which gave the corresponding target products in 30–89% yield for 25 examples. The reaction proceeds via a consecutive process with S–C bond and S–N bond formation.
New synthetic method is developed to prepare 2‐substituted 4(3H)‐Quinazolinone using green chemistry technique. It is oxidant and ligand‐free, copper‐catalysed self‐condensation of 2‐halobenzamide.