Pyrazoles can be selectively lithiated at different carbons and subsequently react with electrophiles depending on the substitution patterns. 2075-46-9, formula is C3H3N3O2, Name is 4-Nitro-1H-pyrazole. 1-Methyl-5-(trifluoromethyl)pyrazole underwent deprotonation and subsequent carboxylation mainly or exclusively at either the 4-position of the heterocycle or at the nitrogen-attached methyl group. Safety of 4-Nitro-1H-pyrazole.
Fleuti, Marianne;Bartova, Katerina;Slavetinska, Lenka Postova;Tloust’ova, Eva;Tichy, Michal;Gurska, Sona;Pavlis, Petr;Dzubak, Petr;Hajduch, Marian;Hocek, Michal research published 《 Synthesis and Biological Profiling of Pyrazolo-Fused 7-Deazapurine Nucleosides》, the research content is summarized as follows. A series of 8-substituted 1-methyl-1,4-dihydropyrazolo[3′,4′:4,5]pyrrolo[2,3-d]pyrimidine (methylpyrazolo-fused 7-deazapurine) ribonucleosides has been designed and synthesized. Two synthetic approaches to the key heterocyclic aglycon I, (i) a six-step classical heterocyclization starting from 5-chloro-1-methyl-4-nitropyrazole and (ii) a three-step cross-coupling and cyclization approach starting from the zinc 4,6-dichloropyrimidine, gave comparable total yield of 18% vs. 13%. The glycosylation of I was attempted by three different methods but only the Vorbruggen silyl-base protocol was efficient and stereoselective to give desired β-anomeric nucleoside intermediate. Its nucleophilic substitutions or cross-coupling reactions at position 8 and deprotection of the sugar moiety gave eight derivatives of pyrazolo-fused deazapurine ribonucleosides, e.g. II, some of which were weakly fluorescent. Me, amino and methylsulfanyl derivatives exerted sub-micromolar cytotoxic effects in vitro against a panel of cancer and leukemia cell lines, as well as antiviral effect against hepatitis C virus in the replicon assay.
Safety of 4-Nitro-1H-pyrazole, 4-Nitro-1H-pyrazole, also known as 4-Nitropyrazole, is a useful research compound. Its molecular formula is C3H3N3O2 and its molecular weight is 113.08 g/mol. The purity is usually 95%.
4-Nitropyrazole, is a building block for the synthesis of various pharmaceutical compounds, including inhibitors, and therapeutic agents. It can be used for the synthesis of highly selective, brain-penetrant aminopyrazole LRRK2 Inhibitor, as a potentially viable treatment for Parkinson’s disease., 2075-46-9.
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics