Reactions of arenediazonium chlorides with ethyl 2-methyl-and 2-chloro-4-oxobutanoates gave, respectively, ethyl 2-(arylhydrazono)propanoates and chloro(arylhydrazono)acetates. Ethyl 2-(arylhydrazono)-propanoates reacted with the Vilsmeier-Haak reagent to give ethyl 1-aryl-4-formyl-1H-pyrazole-3-carboxylates. Ethyl 1-aryl-4-acetyl-5-methyl-1H-pyrazole-3-carboxylates were obtained by reaction of chloro(arylhydrazono) acetates with acetylacetone. Reactions of the obtained pyrazole derivatives with hydrazine and methylhydrazine led to the formation of the corresponding 3,4-R(2)(1)-6-R(2)-2-aryl-2,6-dihydro-7H-pyrazolo[3,4-d]pyridazin-7-ones (R(1), R(2) = H, Me) which were subjected to alkylation and sulfurization.
Cardia, M. C.; Maccioni, E.; Bonsignore, L., Journal of Heterocyclic Chemistry, 2003, vol. 40, # 2, p. 310 - 316
作者:Cardia, M. C.、Maccioni, E.、Bonsignore, L.
DOI:——
日期:——
COCCO, M. T.;MACCIONI, A.;PLUMITALLO, A., FARMACO. ED. SCI., 1985, 40, N 4, 272-284
作者:COCCO, M. T.、MACCIONI, A.、PLUMITALLO, A.
DOI:——
日期:——
US4042706A
申请人:——
公开号:US4042706A
公开(公告)日:1977-08-16
Molecular design of pyrazolo[3,4-d]pyridazines
作者:V. S. Matiichuk、M. A. Potopnyk、N. D. Obushak
DOI:10.1134/s1070428008090182
日期:2008.9
Reactions of arenediazonium chlorides with ethyl 2-methyl-and 2-chloro-4-oxobutanoates gave, respectively, ethyl 2-(arylhydrazono)propanoates and chloro(arylhydrazono)acetates. Ethyl 2-(arylhydrazono)-propanoates reacted with the Vilsmeier-Haak reagent to give ethyl 1-aryl-4-formyl-1H-pyrazole-3-carboxylates. Ethyl 1-aryl-4-acetyl-5-methyl-1H-pyrazole-3-carboxylates were obtained by reaction of chloro(arylhydrazono) acetates with acetylacetone. Reactions of the obtained pyrazole derivatives with hydrazine and methylhydrazine led to the formation of the corresponding 3,4-R(2)(1)-6-R(2)-2-aryl-2,6-dihydro-7H-pyrazolo[3,4-d]pyridazin-7-ones (R(1), R(2) = H, Me) which were subjected to alkylation and sulfurization.
BERNARD, A.;COCCO, M. T.;MACCIONI, A.;PLUMITALLO, A., FARMACO. ED. SCI., 1985, 40, N 4, 259-271
作者:BERNARD, A.、COCCO, M. T.、MACCIONI, A.、PLUMITALLO, A.