Phosphonium acidic ionic liquid: an efficient and recyclable homogeneous catalyst for the synthesis of 2-arylbenzoxazoles, 2-arylbenzimidazoles, and 2-arylbenzothiazoles
作者:Quang The Nguyen、Anh-Hung Thi Hang、Thuy-Linh Ho Nguyen、Duy-Khiem Nguyen Chau、Phuong Hoang Tran
DOI:10.1039/c8ra01709c
日期:——
A highly efficient and green strategy for the synthesis of 2-arylbenzoxazoles, 2-arylbenzimidazoles, and 2-arylbenzothiazoles catalyzed by phosphonium acidic ionic liquid has been developed via the condensation of o-aminophenol, o-phenylenediamines, and o-aminothiophenol, respectively, with aldehydes. The reaction has a good yield, the broad substrate scope, and mild condition. Triphenyl(butyl-3-s
分别通过邻氨基苯酚、邻苯二胺和邻氨基苯硫酚的缩合,开发了一种由鏻酸性离子液体催化合成 2-芳基苯并恶唑、2-芳基苯并咪唑和 2-芳基苯并噻唑的高效绿色策略,与醛。该反应收率好,底物范围广,条件温和。三苯基(丁基-3-磺酰基)鏻甲苯磺酸盐催化剂通过一锅法合成很容易从廉价且可用的起始材料中获得。其结构经1 H NMR、13 C NMR、31P NMR和FT-IR技术。热稳定性和酸度等其他性质采用TGA和Hammett酸度函数法测定。有趣的是,催化剂在第四次复苏之前仍能保持其持续的出色表现。