Synthesis and some reactions of 4-(ethoxycarbonyl)-1,5-diphenyl-1<i>H</i>-pyrazole-3-carboxylic acid
作者:Ahmet Şener、İshak Bildirici、İsrafil Tozlu、Hasan Genç、Kadir Arısoy
DOI:10.1002/jhet.5570440516
日期:2007.9
1,5-Diphenyl-1H-pyrazole-3,4-dicarboxylic acid-4-ethyl ester 2, obtained from the 4-ethoxycarbonyl-5-phenyl-2,3-furandione 1 and N-benzylidene-N′-phenyl hydrazine, was converted via reactions of its acid chloride 3 with various alcohols or N-nucleophiles into the corresponding ester 5 or amide derivatives 6, respectively. In addition, 2 was decarboxylated to give ethyl 1,5-diphenylpyrazole-4-carboxylate
1,5-二苯基-1- ħ吡唑-3,4-二甲酸-4-乙基酯2,从4-乙氧羰基-5-苯基-2,3-呋喃二酮获得1和Ñ -benzylidene- Ñ ' -苯基肼通过其酰氯3与各种醇或N-亲核试剂的反应分别转化为相应的酯5或酰胺衍生物6。另外,将2脱羧得到1,5-二苯基吡唑-4-羧酸乙酯4。腈7衍生物的2也通过脱水而获得图6a在SOCl 2和DMF的混合物中。2与水合肼的环缩合反应导致吡唑并[3,4- d ]哒嗪-4,7-二酮8的形成,而3与无水肼的反应则提供了一种新的双吡唑衍生物9。