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。
Formation of Acyl-Substituted Nitrile Ylides by Rh<sub>2</sub>(OAc)<sub>4</sub>-Catalyzed Decomposition of<i>α</i>-Diazocarbonyl Compounds in Nitriles
作者:Kazuaki Fukushima、Toshikazu Ibata
DOI:10.1246/bcsj.68.3469
日期:1995.12
The Rh2(OAc)4-catalyzed reactions of α-diazocarbonyl compounds in nitrile in the presence of dimethyl acetylenedicarboxylate (DMAD) gave oxazole and pyrrole derivatives. The formation of the oxazole derivatives is explained in terms of the 1,5-cyclization of an acyl-substituted nitrileylide intermediate, and the formation of the pyrrole derivatives is explained by the 1,3-dipolar cycloaddition of
Synthesis of Oxazoles through Copper-Mediated Aerobic Oxidative Dehydrogenative Annulation and Oxygenation of Aldehydes and Amines
作者:Zejun Xu、Chun Zhang、Ning Jiao
DOI:10.1002/anie.201206382
日期:2012.11.5
A fragment‐assembling strategy is used to form oxazoles from aryl acetaldehydes, amines, and molecular oxygen under mild conditions (see scheme). The transformation is highly efficient with the removal of six hydrogen atoms, including the cleavage of four C(sp3)H bonds.
Formation and Reaction of Acyl Substituted Nitrile Ylide through the Rh<sub>2</sub>(OAc)<sub>4</sub>-Catalyzed Reaction of α-Diazocarbonyl Compounds with Benzonitrile
作者:Toshikazu Ibata、Kazuaki Fukushima
DOI:10.1246/cl.1992.2197
日期:1992.11
The rhodium(II) acetate-catalyzedreaction of α-diazocarbonyl compounds with benzonitrile and dimethyl acetylenedicarboxylate gave oxazoles and pyrrole-3,4-dicarboxylates through the 1,5-cyclizatio...