63514-82-9Relevant academic research and scientific papers
In Situ Generation of Nitrilimines from Aryldiazonium Salts and Diazo Esters: Synthesis of Fully Substituted Pyrazoles under Room Temperature
Shao, Ying,Zheng, Hao,Qian, Junfeng,Wan, Xiaobing
supporting information, p. 2412 - 2415 (2018/04/27)
A novel one-pot synthesis for fully substituted pyrazoles has been well developed via the in situ generation of nitrilimines from aryldiazonium salts and diazo esters and a subsequent cycloaddition with 1,3-dicarbonyl compounds. High yields, mild conditio
Molecular design of pyrazolo[3,4-d]pyridazines
Matiichuk,Potopnyk,Obushak
experimental part, p. 1352 - 1361 (2009/09/06)
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-1 H-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-R2-2-aryl-2,6-dihydro-7H-pyrazolo-[3,4-d]pyridazin-7- ones (R1, R2 = H, Me) which were subjected to alkylation and sulfurization.
