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
描述了5-取代的恶唑的可规模化和高度区域选择性的C-4溴化。使用DMF作为溶剂在显着提高C-4 / C-2溴化率方面起着关键作用。结果表明,生成的4-溴恶唑与芳基硼酸是良好的Suzuki-Miyaura偶联伙伴。此外,采用三乙胺的简单方便的方法可将钯和铁的残留量有效地清除至小于10 ppm。