Sonochemical synthesis of polyarylated oxazoles as potential cytotoxic agents
作者:Venkata Ramana Kandula、Mohanreddy Pothireddy、K. Suresh Babu、Ravikumar Kapavarapu、Rambabu Dandela、Manojit Pal
DOI:10.1016/j.tetlet.2021.153011
日期:2021.4
The ultrasound assisted facile, rapid and one-pot synthesis of 2-aryl substituted 4,5-diphenyloxazoles was achieved via the reaction of commercially available benzoin (or 2-hydroxy-2-phenylacetophenone) with benzylamines in the presence of IBX under mild conditions. The methodology involved initial IBX mediated conversion of benzoin to benzil and then reaction with benzylamine followed by intramolecular
CuI-catalyzed and air promoted oxidative cyclization for one-pot synthesis of polyarylated oxazoles
作者:Ping Hu、Qiang Wang、Yizhe Yan、Shuai Zhang、Baiqun Zhang、Zhiyong Wang
DOI:10.1039/c3ob40657a
日期:——
A facile CuI-catalyzed and air promoted oxidative cyclization was developed for the synthesis of polyarylated oxazoles. By virtue of this method, a variety of arylated oxazoles could be easily synthesized from readily available starting materials at room temperature in air.
divergent approach to indoles and oxazoles from enamides has been developed. The picolinamide-derived enamides undergo the intramolecular aromatic C–H amination in the presence of a Cu(OPiv)2 catalyst and an MnO2 oxidant to form the corresponding indoles in good yields. On the other hand, simpler aryl- or alkyl-substituted enamides are converted to the 2,4,5-trisubstituted oxazole frameworks via vinylic C–H
A palladium‐catalyzed tandem reaction of cyanomethyl benzoates with arylboronic acids has been achieved. Substitution at the 2‐position of cyanomethyl benzoates was found to be crucial for the selective synthesis of oxazoles and isocoumarins. Cyanomethyl benzoates afforded 2,4‐diaryloxazoles as products, while 2‐benzoyl‐substituted cyanomethyl benzoates delivered 3‐benzoyl‐4‐aryl‐isocoumarins selectively
An efficient synthesis of trisubstituted oxazoles via chemoselective O-acylations and intramolecular Wittig reactions
作者:Yi-Ling Tsai、Yu-Shiou Fan、Chia-Jui Lee、Chan-Hui Huang、Utpal Das、Wenwei Lin
DOI:10.1039/c3cc45883k
日期:——
Preparation of new types of trisubstituted oxazoles is realized via chemoselective O-acylations and intramolecular Wittig reactions with ester functionalities using in situ formed phosphorus ylides as key intermediates. A plausible reaction mechanism for this undiscovered chemistry is also proposed based on the existence of expected and rearranged isomeric oxazoles.