Issue 58, 2020, Issue in Progress

Pyridine-2-carboxylic acid as an effectual catalyst for rapid multi-component synthesis of pyrazolo[3,4-b]quinolinones

Abstract

Green synthesis of pyrazolo[3,4-b]quinolinones was designed using bioproduct pyridine-2-carboxylic acid (P2CA) as a green and efficient catalyst. The multi-component reaction of aldehydes, 1,3-cyclodiones and 5-amino-1-phenyl-pyrazoles regioselectively produced pyrazolo[3,4-b]quinolinones in excellent yield (84–98%). Recyclization of the catalyst was also investigated. The electronic effect of the various substituents in aromatic rings indicated that the reaction proceeded through the carbocation intermediate. This newly designed protocol very quickly constructed products conventionally under milder conditions.

Graphical abstract: Pyridine-2-carboxylic acid as an effectual catalyst for rapid multi-component synthesis of pyrazolo[3,4-b]quinolinones

Supplementary files

Article information

Article type
Paper
Submitted
04 Aug 2020
Accepted
19 Sep 2020
First published
25 Sep 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 35499-35504

Pyridine-2-carboxylic acid as an effectual catalyst for rapid multi-component synthesis of pyrazolo[3,4-b]quinolinones

M. G. Sharma, R. M. Vala and H. M. Patel, RSC Adv., 2020, 10, 35499 DOI: 10.1039/D0RA06738E

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