Regioselective Functionalization of the Oxazole Scaffold Using TMP-Bases of Mg and Zn
摘要:
A general method for the synthesis of 2,4,5-trisubstituted oxazoles has been developed. Starting from commercially available oxazole, successive metalations using TMPMgCl center dot LiCl or TMPZnCl center dot LiCl led to the corresponding magnesiated or zincated species which were stable toward ring fragmentation. Furthermore, they readily reacted with various electrophiles, such as aryl and allylic halides, acid chlorides, TMSCl, and TMS-CN, providing highly functionalized oxazoles.
Gold-Catalyzed Radical-Involved Intramolecular Cyclization of Internal <i>N</i>-Propargylamides for the Construction of 5-Oxazole Ketones
作者:Hejun An、Shaoyu Mai、Qingqing Xuan、Yao Zhou、Qiuling Song
DOI:10.1021/acs.joc.8b02334
日期:2019.1.4
An expedient strategy for the synthesis of 5-oxazole ketones was developed via homogeneous gold catalysis with 4-MeO-TEMPO as an oxidant. The desired 5-oxazole ketones were achieved in decent yields with an excellent functional group compatibility under mild conditions. The current protocol also represents the first example for merging a gold catalyst and radical chemistry in one-pot synthesis with