Facile Preparation of 2-Substituted Benzoxazoles and Benzothiazoles via Aerobic Oxidation of Phenolic and Thiophenolic Imines Catalyzed by Polymer-Incarcerated Platinum Nanoclusters
Platinum nanoclusters supported on a polymer/carbon black composite material was found to be an excellent catalyst for the oxidative cyclization of phenolic and thiophenolic Schiff bases to 2-substituted benzoxazoles and benzothiazoles under ambient conditions.
The palladium-catalyzed tandem decarboxylation, carbon–carbon triple bond oxidation and decarbonylative arylation of the benzoxazole C–H bond
作者:Dongfang Liu、Bin Liu、Jiang Cheng
DOI:10.1039/c3ra41185k
日期:——
A palladium-catalyzed arylation of benzoxazole has been developed. This protocol involves the tandem decarboxylation and oxidation of a carbonâcarbon triple bond followed by decarbonylative arylation of the benzoxazole CâH bond.
Cu-Catalyzed Synthesis of Benzoxazole with Phenol and Cyclic Oxime
作者:Zheng-Hai Wang、Dong-Hui Wang
DOI:10.1021/acs.orglett.1c04322
日期:2022.1.21
A Cu-catalyzed straightforward synthesis of benzoxazoles from free phenols and cyclic oxime esters is reported. The mild reaction conditions tolerate various electron-withdrawing and electron-donating functional groups on both substrates, affording benzoxazoles in moderate to good yields. With this protocol, large-scale syntheses of Ezutromid and Flunoxaprofe in one or two steps are demonstrated. A
Facile and Efficient Synthesis of Benzoxazoles and Benzimidazoles: The Application of Hantzsch Ester 1,4-Dihydropyridines in Reductive Cyclization Reactions
Both benzoxazole and benzimidazole are common heterocyclic scaffolds in biologically active and medicinally significant compounds. Reductivecyclization of ortho-substituted nitrobenzene derivatives provides an attractive route to benzoxazole or benzimidazole ring formation. Unfortunately, only a few synthetic methods by reductivecyclization of ortho-nitro compounds have been reported and the yields