One-Pot Preparation of 6-Substituted 3(2<i>H</i>)-Pyridazinones from Ketones
作者:W. J. Coates、A. Mckillop
DOI:10.1055/s-1993-25861
日期:——
A one-pot process for the preparation of 6-phenyl-3(2H)-pyridazinone from acetophenone and glyoxylic acid has been investigated and shown to have wide utility in the preparation of 6- and 5,6-substituted 3(2H)-pyridazinones. Limitations to the process encountered with 2′-hydroxyacetophenone and with basic heteroaromatic ketones have been overcome, and the processes described offer the rapid and efficient synthesis of many 6-substituted pyridazinones from readily available ketones.
Substituted derivatives of 3-chloro-6-phenylpyridazine which are useful intermediates in the preparation of substituted phenylhydrazinopyridazines which have .beta.-adrenergic blocking and vasodilator activity.
Process for preparing 6-(2-hydroxyphenyl)-3-pyridazinone
申请人:Smith Kline & French Laboratories Limited
公开号:US04528371A1
公开(公告)日:1985-07-09
A process for preparing 6-(2-hydroxyphenyl)-3-pyridazinone which comprises reacting 2-hydroxyacetophenone with glyoxylic acid under alkaline conditions, adjusting the pH of the reaction mixture to give a mixture within a pH range of about pH 4.0-9.5 and which contains a weak base, and subsequently reacting with hydrazine. 6-(2-Hydroxyphenyl)-3-pyridazinone is a useful intermediate in the preparation of anti-hypertensive agents.
Process for preparing 3-chloro-6-(2-hydroxyphenyl)-pyridazines
申请人:SmithKline Corporation
公开号:US04340733A1
公开(公告)日:1982-07-20
A process for preparing 3-chloro-6-(2-hydroxyphenyl)pyridazines by the reaction of 6-(2-hydroxyphenyl)-3(2H)-pyridazinones with phosphorus oxychloride and a disubstituted formamide. The chloropyridazine compounds are useful intermediates for preparing compounds which have .beta.-adrenergic blocking and vasodilator activity and are useful as antihypertensive agents.