Development of a new cascade reaction for convergent synthesis of pyrazolo[1,5-a]quinoline derivatives under transition-metal-free conditions was written by Kato, Jun-ya;Aoyama, Hiroshi;Yokomatsu, Tsutomu. And the article was included in Organic & Biomolecular Chemistry in 2013.Product Details of 15953-73-8 This article mentions the following:
A method for the synthesis of pyrazolo[1,5-a]quinolines under the transition-metal-free conditions has been developed. This method involves a novel combination of aromatic nucleophilic substitution and Knoevenagel condensation reactions to give pyrazolo[1,5-a]quinolines. In the experiment, the researchers used many compounds, for example, 4-Chloro-3,5-dimethyl-1H-pyrazole (cas: 15953-73-8Product Details of 15953-73-8).
4-Chloro-3,5-dimethyl-1H-pyrazole (cas: 15953-73-8) belongs to pyrazole derivatives. Pyrazoles, a five-membered heterocycle containing two adjacent nitrogen atoms, are the core structures found in a number of molecules that possess a wide range of pharmaceutical and agricultural activities. Protonation of pyrazole in strong acid leads to pyrazolium cations, which undergo electrophilic substitution preferentially at C3 rather than C4. The pyrazole anion is not reactive toward nucleophiles but is mostly reactive to electrophiles.Product Details of 15953-73-8
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics