Selective and Efficient Generation of ortho-Brominated para-Substituted Phenols in ACS-Grade Methanol
作者:David Georgiev、Bartholomeus Saes、Heather Johnston、Sarah Boys、Alan Healy、Alison Hulme
DOI:10.3390/molecules21010088
日期:——
The mono ortho-bromination of phenolic building blocks by NBS has been achieved in short reaction times (15-20 min) using ACS-grade methanol as a solvent. The reactions can be conducted on phenol, naphthol and biphenol substrates, giving yields of >86% on gram scale. Excellent selectivity for the desired mono ortho-brominated products is achieved in the presence of 10 mol % para-TsOH, and the reaction
使用 ACS 级甲醇作为溶剂,NBS 已在较短的反应时间内(15-20 分钟)实现了酚类结构单元的单邻位溴化。该反应可以在苯酚、萘酚和双酚底物上进行,克级产率 >86%。在 10 mol% 对位 TsOH 的存在下,对所需的单邻溴化产物具有出色的选择性,并且该反应显示出对一系列取代基的耐受性,包括 CH3、F 和 NHBoc。