AbstractAn electrochemical strategy for the efficient synthesis of 2‐substituted benzoxazoles was developed using a catalytic amount of sodium iodide (NaI) as a redox catalyst in a two‐phase buffer system.magnified image
Synthesis of 2-substituted pyrimidines and benzoxazoles via a visible-light-driven organocatalytic aerobic oxidation: enhancement of the reaction rate and selectivity by a base
作者:Lin Wang、Zhi-Gang Ma、Xiao-Jing Wei、Qing-Yuan Meng、Deng-Tao Yang、Shao-Fu Du、Zi-Fei Chen、Li-Zhu Wu、Qiang Liu
DOI:10.1039/c4gc00337c
日期:——
An efficient visible-light-driven photocatalytic oxidation of various 2-substituted dihydropyrimidines and phenolic imines has been achieved using an organic photocatalyst eosin Y bis(tetrabutyl ammonium salt) (TBA-eosin Y) and inexpensive oxidant molecular oxygen. With the aid of a base, significantly enhanced photoinduced electron transfer from substrates dihydropyrimidines or phenolic imines to the excited state of TBA-eosin Y has enabled the aerobic oxidation to yield 2-(methylthio)pyrimidines or 2-arylbenzoxazoles selectively.
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.
Iron(III) Chloride Mediated
<i>para</i>
‐Selective C‐H Functionalization: Access to C5‐Chloro and C5,C7‐Dichloro/Dianisyl Substituted 2‐Arylbenzoxazoles
作者:Kanchanbala Sahoo、Niranjan Panda
DOI:10.1002/adsc.202101359
日期:2022.3
Iron(III) chloride mediated para-selective C−H chlorination and subsequent annulation of 2-amidophenol to synthesize C5- and C5, C7-chlorinated benzoxazoles was developed. Further, the oxidative cross-dehydrogenative coupling of amidophenol with anisole by ferricchloride was explored to achieve the remotely anisylated benzoxazoles.
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.
An Efficient Synthesis of 2-Substituted Benzoxazoles via RuCl3·3H2O Catalyzed Tandem Reactions in Ionic Liquid
作者:Xuesen Fan、Yan He、Yangyang Wang、Xinying Zhang、Jianji Wang
DOI:10.1002/cjoc.201190156
日期:2011.4
An efficientsynthesis of 2‐substituted benzoxazoles through RuCl3·3H2Ocatalyzed, air oxidized tandemreactions of 2‐aminophenols and aldehydes in [bmim]BF4 was developed. This synthetic strategy has such advantages as mild reaction conditions, cost‐free oxidant, readily available starting materials, and recyclable catalyst and solvent. As an application, it was successfully used in the synthesis of