Deep eutectic solvent-catalyzed arylation of benzoxazoles with aromatic aldehydes
作者:Phuong Hoang Tran、Anh-Hung Thi Hang
DOI:10.1039/c8ra01094c
日期:——
A novel and efficient methodology for the arylation of benzoxazoles with aromaticaldehydes catalyzed by deep eutectic solvent has been developed. The reaction smoothly proceeded with a wide range of substrates to give the desired products in high yields within short reaction time. Deep eutectic solvents are easily recovered and reused without significant loss of catalytic activity.
One pot synthesis of 2-phenylbenzoxazoles by potassium cyanide assisted reaction of o-aminophenols and benzaldehydes
作者:Horacio Reyes、Hiram I. Beltran、Ernesto Rivera-Becerril
DOI:10.1016/j.tetlet.2010.11.038
日期:2011.1
The 2-phenylbenzoxazoles were obtained in moderate to good yields by reaction of the substituted o-aminophenols with benzaldehydes in the presence of one equivalent of potassiumcyanide as an equimolecular catalyst in N,N-dimethylformamide at room temperature.
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。
A new superacid hafnium-based metal–organic framework as a highly active heterogeneous catalyst for the synthesis of benzoxazoles under solvent-free conditions
作者:Linh H. T. Nguyen、The T. Nguyen、Ha L. Nguyen、Tan L. H. Doan、Phuong Hoang Tran
DOI:10.1039/c7cy01668a
日期:——
A new superacid Hf-based MOF, termed VNU-11-P-SO4, was used as an efficient heterogeneous catalyst for solvent-free 2-arylbenzoxazole synthesis.
Sulfur/DABCO Promoted Reductive Coupling/Annulation Cascade Reaction between o-Hydroxy/Amino Nitrobenzenes and Benzaldehydes
作者:Phuong Hoang Tran、Minh-Huy Dinh Dang、Linh Ho Thuy Nguyen
DOI:10.1055/s-0039-1690823
日期:2020.6
Sulfur/DABCO was found to be an efficient reagent in promoting the reductivecoupling/annulation of o-nitrophenols or o-nitroanilines with benzaldehydes. This method represents a simple, straightforward, and green approach to the construction of benzoxazoles and benzimidazoles.