Iodide catalyzed synthesis of 2-aminobenzoxazoles via oxidative cyclodesulfurization of phenolic thioureas with hydrogen peroxide
作者:Vinod K. Yadav、Vishnu P. Srivastava、Lal Dhar S. Yadav
DOI:10.1016/j.tetlet.2017.12.019
日期:2018.1
A convenient and efficient oxidative cyclodesulfurization of o-phenolic thioureas to 2-aminobenzoxazoles employing TBAI (tetrabutylammonium iodide)/H2O2 catalyst/reagent system is reported. The protocol utilizes and offers a number of desired features such as metal-free, base-free, simple operation, room temperature, low cost catalyst/reagent, no need for anhydrous and inert conditions. The approach
报道了使用TBAI(碘化四丁铵)/ H 2 O 2催化剂/试剂系统将邻苯酚硫脲方便且有效地氧化成2-氨基苯并恶唑的氧化环脱硫。该方案利用并提供了许多所需的功能,例如无金属,无碱,操作简单,室温,低成本的催化剂/试剂,不需要无水和惰性条件。该方法还适用于直接从邻氨基苯酚和异硫氰酸芳基酯开始的一锅合成2-氨基苯并恶唑,产率高。
Microwave assisted one pot synthesis of 2-ethylamino benzimidazole, benzoxazole and benzothiazole derivatives
作者:Thirupathi Rapolu、Pavan Kumar K. V. P.、Korupolu Raghu Babu、Satheesh Kumar Dende、Rajashekar Reddy Nimmareddy、Leleti Krishnakanth Reddy
DOI:10.1080/00397911.2019.1599952
日期:2019.5.19
rapid and efficient one-pot method for the synthesis of 2-ethylamino benzimidazole, benzoxazole, and benzothiazole derivatives has been described. The reaction of o-phenylenediamines or o-aminophenols or 2-mercaptoanilines with EDC.HCl under microwave irradiation afforded the corresponding 2-ethylamino benzimidazole, benzoxazole and benzothiazole derivatives in excellent yields. Graphical Abstract
A general synthesis of N-aryl- and N-alkyl-2-aminobenzoxazoles
作者:Zhenping Tian、Daniel J. Plata、Steven J. Wittenberger、Ashok V. Bhatia
DOI:10.1016/j.tetlet.2005.09.177
日期:2005.11
An efficient and practical synthetic procedure is described for the preparation of a variety of N-substituted aryl- and alkyl-2-aminobenzoxazoles. This new method offers broad utility and provides desired products in good to excellent yield. The title compounds are formed in a one-pot, two step reaction sequence that is safe and operationally straightforward. (c) 2005 Elsevier Ltd. All rights reserved.