A highly efficient method for the synthesis of oxazole derivativesfrom simple amides and ketones has been established via a Pd(II)-catalyzed sp2 C–H activation pathway in one step. The reaction is supposed to proceed through a C–Nbond formation followed by a C–O bond formation closing the ring. Because of the simple and readily available starting materials, easy operation, and high bioactivity of
Copper-catalyzed oxidative cyclization of arylamides and β-diketones: new synthesis of 2,4,5-trisubstituted oxazoles
作者:Yang Bai、Wen Chen、Ya Chen、Huawen Huang、Fuhong Xiao、Guo-Jun Deng
DOI:10.1039/c4ra14394a
日期:——
A novel copper catalyzed approach to oxazoles via enamide intermediates was developed from benzamides and β-diketones. The successive condensation and cyclization reactions afforded various 2,4,5-trisubstituted oxazoles in good yields.
A quick and easy access to a series of thiocyanated enaminones and 2‐iminothiazolones using
<scp>PIDA</scp>
under mild conditions
作者:Daiki Matsui、Shinji Tanimori
DOI:10.1002/jhet.4492
日期:2022.9
A series of thiocyanatedenaminones and 2-iminothiazolones have been synthesized usingPIDA as an oxidant with Brønsted acid under the mild reaction conditions starting from the acyclic and cyclic enaminones. Direct synthesis of 2-iminothiazolones have also been achieved by treating alkali solution after thiocyanation in a one-pot manner.