An efficient and convenient method for the bromination of pyrazolones and 5-hydroxypyrazoles was developed by using N-bromobenzamide in THF at room temperature. This new method provided di-bromimated pyrazolones in excellent yields (>= 90%). Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved
Dibromination of 5-pyrazolones and 5-hydroxypyrazoles via dibromoisocyanuric acid
作者:Kaung-Min Cheng、Jin Bin Wu、Hui-Chang Lin、Jiann-Jyh Huang、Yu-Ying Huang、Shao-Kai Lin、Tsung-Ping Lin、Fung Fuh Wong
DOI:10.1002/jhet.442
日期:——
A safe and efficient method was developed for the dibromination of pyrazolones and 5‐hydroxypyrazoles by use of dibromoisocyanuricacid (DBI). The reaction gave the corresponding dibrominated pyrazolones in excellent yields (≥91%). J. Heterocyclic Chem., (2010).