Synthesis of Substituted Oxazoles by Visible-Light Photocatalysis
作者:Tanmay Chatterjee、Ji Young Cho、Eun Jin Cho
DOI:10.1021/acs.joc.6b00989
日期:2016.8.19
A simple and practical method for the synthesis of substituted oxazoles has been developed using readily available α-bromoketones and benzylamines by visible-light photocatalysis at room temperature. The process, which requires 1 mol % of [Ru(bpy)3]Cl2 photocatalyst with K3PO4 and CCl3Br, is effective for accessing a variety of valuable oxazole compounds. The synthetic utility of our protocol was also
已经开发了一种简单而实用的合成取代的恶唑的方法,该方法使用易得的α-溴代酮和苄胺,在室温下通过可见光光催化进行合成。该方法需要1摩尔%的具有K 3 PO 4和CCl 3 Br的[Ru(bpy)3 ] Cl 2光催化剂,可有效地获得各种有价值的恶唑化合物。我们的协议的合成效用也通过制备天然产物texaline得到了证明。
One-Pot Friedel−Crafts/Robinson−Gabriel Synthesis of Oxazoles Using Oxazolone Templates
作者:Manasi Keni、Jetze J. Tepe
DOI:10.1021/jo0501590
日期:2005.5.1
We report herein a one-potsynthesis of 2,4,5-trisubstituted oxazoles via a Friedel−Crafts/Robinson−Gabriel synthesisusing a general oxazolone template. Treatment of the oxazolone template with a range of aromatic nucleophiles provided the highly substituted oxazoles in good yields.
Copper-catalyzed oxidative cyclization of chalcone and benzylic amine leading to 2,5-diaryl oxazoles via carbon–carbon double bond cleavage
作者:Dongfang Liu、Jintao Yu、Jiang Cheng
DOI:10.1016/j.tet.2013.12.077
日期:2014.2
oxidative cyclization of chalcone with benzylic amine is achieved, providing 2,5-diaryl oxazoles in moderate to good yields. The procedure employs O2 as a clean oxidant and involves an oxidative cleavage of the CC bond as the key step.
A facile type of one-pot, transition-metal-free domino process was developed for the synthesis of oxazoles. Thus, a variety of polysubstituted oxazoles were easily synthesized via t-BuOOH/I2-mediated dominooxidativecyclization from readily available starting materials under mild conditions.
开发了一种简便的单罐,无过渡金属的多米诺骨牌工艺,用于合成恶唑。因此,通过t- BuOOH / I 2介导的多米诺氧化环化反应可以容易地在温和条件下从容易获得的起始原料合成多种多取代的恶唑。
A New Approach to Ring Expansion of Keto Aziridines to 2,5-Diaryloxazoles
作者:Heshmat Samimi、Somaye Mohammadi
DOI:10.1055/s-0032-1317925
日期:——
Ringexpansion of keto aziridines to the corresponding 2,5-diaryl oxazoles in the presence of dicyclohexyl carbodiimide and iodine under refluxing acetonitrile conditions is described. A plausible mechanism is proposed.