A novel palladium-catalyzed approach for constructing 2,5-diarylated oxazole-4-carboxylates using sodium arylsulfinates as the aryl source has been demonstrated.
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。
NIS-TBHP promoted oxidative coupling of C N and C O bonds: A metal-free approach to polysubstituted oxazoles
作者:Shengxiang Yang、Yuzhu Yang、Fei Li、Xiaolan Liu
DOI:10.1016/j.tetlet.2020.151846
日期:2020.5
A metal-free approach to polysubstituted oxazoles via the oxidative coupling of readily available benzylamines and 1,3-dicarbonyl derivatives in the presence of an external base has been developed. A variety of functional groups on both of the starting materials are tolerated using this method, affording the corresponding oxazoles in moderate to good yields. Iodination was proposed as the initiation