Syntheses of 4,5-Disubstituted Oxazoles via Regioselective C-4 Bromination
作者:Bryan Li、Richard A. Buzon、Zhijun Zhang
DOI:10.1021/op700176n
日期:2007.11.1
A scaleable and highly regioselective C-4 bromination of 5-substituted oxazoles is described. The use of DMF as solvent played a critical role in significantly improving the C-4/C-2 bromination ratio. The resulting 4-bromooxazoles were shown to be good Suzuki–Miyaura coupling partners with arylboronic acids. Furthermore, a simple and convenient method that employs triethylamine efficiently purged residual