Convenient Route to Trisubstituted Oxazoles via a Copper-Catalysed Tandem Oxidative Cyclisation by Oxygen Oxidation
作者:Chengqun Chen、Wenfu Chen、Qianhong Bao
DOI:10.3184/174751915x14192609116136
日期:2015.1
cyclisation has been developed for the synthesis of trisubstitutedoxazoles, which is thought to proceed through cascade formation of C-N and C-O bonds by oxygen oxidation. The desired products can be obtained from readily available starting materials while avoiding hazardous materials. Therefore, a green synthetic method for the preparation of oxazoles has been found.
一种新型的铜催化氧化环化反应已被开发用于合成三取代恶唑,据认为该反应是通过氧氧化级联形成 CN 和 CO 键来进行的。所需的产品可以从容易获得的起始材料中获得,同时避免使用有害材料。因此,发现了一种制备恶唑的绿色合成方法。
Metal-free, organocatalytic cascade formation of C–N and C–O bonds through dual sp<sup>3</sup>C–H activation: oxidative synthesis of oxazole derivatives
An organocatalytic cascade reaction that involves the formation of C-N, C-O and C=N bonds in one process via dual sp(3) C-H activation has been developed. This protocol affords a facile metal-free methodology for the synthesis of oxazole derivatives in air under mild conditions.
An efficient electrochemical synthesis of poly-substituted oxazoles from readily available β-diketone derivatives and benzylamines is described. This electrochemical procedure does not need hazardous oxidants and transition metal catalysts as well as molecular I2 additives. Compared with the traditional thermo-chemical method, the present electrochemical method is greener and more efficient.
Facile Synthesis of Polysubstituted Oxazoles via A Copper-Catalyzed Tandem Oxidative Cyclization
作者:Changfeng Wan、Jintang Zhang、Sujing Wang、Jinmin Fan、Zhiyong Wang
DOI:10.1021/ol100688c
日期:2010.5.21
A highly efficient synthesis of polysubstituted oxazoles was developed via a copper-catalyzed tandem oxidative cyclization. The desired products can be obtained from readily available starting materials under mild conditions. This is an attractive alternative method for the synthesis of oxazole derivatives.
A Highly Efficient Heterogeneous Copper-Catalyzed Oxidative Cyclization of Benzylamines and 1,3-Dicarbonyl Compounds To Give Trisubstituted Oxazoles
作者:Li Wei、Shengyong You、Yuxin Tuo、Mingzhong Cai
DOI:10.1055/s-0037-1610710
日期:2019.8
yields. This heterogeneous copper catalyst can be facilely prepared via a simple two-step procedure from readily available and inexpensive reagents and exhibits a slightly higher activity than Cu(OAc)2. MCM-41-2N-Cu(OAc)2 is also easy to recover and can be recycled up to eight times with almost consistent activity. The reaction is the first example of heterogeneous copper-catalyzed intermolecular cyclization