Functionalization and cyclization reactions of 4-benzoyl-1,5-diphenyl- 1<i>H</i>-pyrazole-3-carboxylic acid
作者:Yunus Akcamur、Ahmet Sener、Alemdar Mustafa Ipekoglu、Gert Kollenz
DOI:10.1002/jhet.5570340133
日期:1997.1
The 1H-pyrazole-3-carboxylic acid 2 or its remarkably stable acid chloride 3 can easily be converted into the corresponding ester or amide derivatives 4 or 5, respectively, from reaction with alcohols or N-nucleophiles. Pyrazolo[3,4-d]pyridazines 6a,b are obtained from cyclocondensation reactions of the pyrazoles 2 and 3, respectively, with phenylhydrazine or hydrazine hydrate, while 6c is formed in
1 H-吡唑-3-羧酸2或其非常稳定的酰氯3可以通过与醇或N-亲核试剂反应轻松地分别转化为相应的酯或酰胺衍生物4或5 。吡唑并[3,4- d ]哒嗪6a,b分别由吡唑2和3与苯肼或水合肼的环缩合反应制得,而6c由呋喃-2,3-一锅法形成。二酮1和水合肼。