Intra- and intermolecular hetero-Diels-Alder reactions. 17. Intramolecular hetero-Diels-Alder reaction of alkylidene- and benzylidenepyrazolones and benzylideneisoxazolones. Investigations toward the conformation of the transition state
Synthetic studies on KF-alumina-catalysed reaction of substituted and unsubstituted aryl-oxoketene dithioacetals and 1H-pyrazone-5(4H)-one: a convenient synthesis of pyrazolo[3,4-b]pyridine and pyrazolo[1,5-a]pyrimidine
作者:Pushpak Mizar、Bekington Myrboh
DOI:10.1016/j.tetlet.2009.04.020
日期:2009.6
The procedures described herein provide a facile method for the synthesis of pyrazolo[3,4-b]pyridine and pyrazolo[1,5-a]pyrimidine by reacting N-substituted or unsubstituted-pyrazol-5(4H)-one, aryl-oxoketene dithioacetals and alkyl amide. The products were obtained in moderate to good yield. The effects of the solvents and substitution have also been described.
本文所述的方法提供了通过使N-取代的或未取代的吡唑-5(4H)-一个芳基反应来合成吡唑并[3,4- b ]吡啶和吡唑并[1,5- a ]嘧啶的简便方法。-氧杂环丁烯二硫缩醛和烷基酰胺。以中等至良好的产率获得产物。还描述了溶剂和取代的作用。
1,3-Dialkyl-4-(iminoarylmethyl)-1H-pyrazol-5-ols. A series of novel potential antipsychotic agents
作者:Lawrence D. Wise、Donald E. Butler、Horace A. DeWald、David M. Lustgarten、Ian C. Pattison、Dieter N. Schweiss、Linda L. Coughenour、David A. Downs、Thomas G. Heffner、Thomas A. Pugsley
DOI:10.1021/jm00393a021
日期:1987.10
An examination of the SAR of related compounds indicated that maximal activity was obtained with analogues containing methyl groups at the 1- and 3-positions on the pyrazole ring and with a 3-chloro substituent on the phenyl ring. Replacement of the hydrogen atom of the imine moiety with various substituents led to loss of activity. Attempts to synthesize the 2-fluorophenyl compound analogous to 2 resulted
Method for producing 1 substituted 5-chloro-4 methly pyrazoles
申请人:——
公开号:US20040102505A1
公开(公告)日:2004-05-27
The present invention relates to a process for preparing 1-substituted 5-chloro-4-methylpyrazoles of the general formula I
1
with the meaning for R stated in claim 1, in which a 4-methylpyrazole of the formula II
2
is reacted with chlorine, the resulting mixture of monochlorinated and dichlorinated product is fractionated by distillation, and subsequently the dichlorinated compound is dehalogenated to compound II and returned to the reaction with chlorine.