We herein report on the selective synthesis of 5-bromo-2,2′-bipyridine 2 and 5,5′-dibromo-2,2′-bipyridine 3 by direct bromination of 2,2′-bipyridine hydrobromide salt 1, as well as by radical decarboxylative bromination of the corresponding acid chlorides.

中文翻译：

---

5-溴和5,5'-dibromo-2,2'-联吡啶的直接合成

本文我们对5-溴-2,2'-联吡啶的选择性合成报告2和5,5'-二溴-2,2'-联吡啶3由2,2'-联吡啶氢溴酸盐的直接溴化1，以及如通过相应的酰氯的自由基脱羧溴化。