Multi-component reaction to access a library of polyfunctionally substituted 4,7-dihydropyrazolo[3,4-<i>b</i>]pyridines
作者:Ranjana Aggarwal、Suresh Kumar、Gulshan Singh
DOI:10.1080/00397911.2019.1582064
日期:2019.4.3
Abstract A practical approach to polyfunctionallysubstituted 4,7-dihydropyrazolo[3,4-b]pyridine derivatives from heteroaryl hydrazine, 3-aryl-3-oxopropanenitriles and aldehydes have been described in the report. The present catalyst-free protocol involves the intermediacy of 5-aminopyrazole and α-cyanochalcone, which undergoes in situ Michael addition to afford title compounds in moderate to good