Synthesis and transformations of 3(5)-(3-methylfurazan-4-yl)-4-nitro-1Н-pyrazole-5(3)-carboxylic acid
作者:Alexandr V. Kormanov、Dmitry L. Lipilin、Tatyana K. Shkineva、Irina A. Vatsadze、Andrei M. Kozeev、Igor L. Dalinger
DOI:10.1007/s10593-017-2141-6
日期:2017.8
obtained by condensation of 3-acetyl-4-methylfurazan with diethyl oxalate with subsequent treatment of the β-diketoester intermediate with hydrazine, and was nitrated to produce 3(5)-(3-methylfurazan-4-yl)-4-nitro-1Н-pyrazole-5(3)-carboxylic acid. The amide of this acid was used in a Hofmann rearrangement, providing 3-amino-5-(4-methylfurazan-3-yl)-4-nitro-1Н-pyrazole, nitration of which yielded the respective
Synthesis and investigation of isomeric mono- and dinitro derivatives of 3-methyl-4-(pyrazol-3-yl)furazan
作者:Igor L. Dalinger、Irina A. Vatsadze、Tatyana K. Shkineva、Alexandr V. Kormanov、Andrei M. Kozeev、Boris B. Averkiev、Alexandr I. Dalinger、Mikhail K. Beklemishev、Aleksei B. Sheremetev
DOI:10.1007/s10593-015-1739-9
日期:2015.6
The regioselective introduction of nitro groups in pyrazoles, containing a furazanyl substituent at position 3(5) was investigated. All synthetically accessible isomericmono- and dinitropyrazole derivatives were obtained. X-ray structural investigation was performed for all mononitroisomers and a dinitro derivative.