Efficient di-bromination of 5-pyrazolones and 5-hydroxypyrazoles by N

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• 作者：Yu-Ying Huang ; Hui-Chang Lin ; Kaung-Min Cheng ; Wei-Nien Su ; Kuan-Chin Sung ; Tsung-Ping Lin ; Jiann-Jyh Huang ; Shao-Kai Lin ; Fung Fuh Wong
• 关键词：Bromination ; N-Bromobenzamide ; Pyrazolones ; 5-Hydroxypyrazoles
• 刊名：Tetrahedron
• 出版年：2009
• 出版时间：14 November 2009
• 年：2009
• 卷：65
• 期：46
• 页码：9592-9597
• 全文大小：253 K

文摘

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 % ).