Meta Halogenation of 1,3-Disubstituted Arenes via Iridium-Catalyzed Arene Borylation
作者:Jaclyn M. Murphy、Xuebin Liao、John F. Hartwig
DOI:10.1021/ja076498n
日期:2007.12.1
copper(II) bromide or chloride converts arylboronic esters to the corresponding aryl halides. A variety of arenes containing alkoxy, alkyl, halogen, nitrile, ester, amide, and pivaloyl and TIPS-protected alcohols were converted to the corresponding 3,5-disubstituted aryl bromides and chlorides in yields ranging from 46% to 85%. In addition, 2,6-disubstituted and 3-substituted pyridines were converted
我们报告了 1,3-二取代芳烃的间位卤化,通过使用铱催化的芳烃硼化化学形成 3,5-二取代芳基溴化物和氯化物。铱催化的芳烃与 B2pin2 发生硼化反应,然后硼酸酯与溴化铜或氯化铜 (II) 反应,将芳基硼酸酯转化为相应的芳基卤化物。各种含有烷氧基、烷基、卤素、腈、酯、酰胺和新戊酰基的芳烃和 TIPS 保护的醇以 46% 到 85% 的产率转化为相应的 3,5-二取代芳基溴化物和氯化物。此外,2,6-二取代和3-取代吡啶分别转化为4-卤代和5-卤代吡啶。