Synthesis of novel precursors of Pfitzinger reaction: A facile one-pot strategy to the synthesis of quinoline carboxylic acid derivatives of pyrazolo-carbazoles and azacarbazoles
作者:RUCHI TYAGI、BHAWANI SINGH、D KISHORE
DOI:10.1007/s12039-012-0240-6
日期:2012.3
Pfitzinger reaction of 9 and 10 with isatin in alkali afforded the corresponding quinoline carboxylic acid derivatives 12 and 13, respectively. Quinoline carboxylic acid derivatives of pyrazolo-carbazoles and azacarbazoles have been synthesized from 5-indazolyldiazonium chloride 2 and 2-hydroxymethylidene cyclohexanone 5 or N-benzyl-3-hydroxymethylidene- 4-piperidone 6 by applying the strategy of Japp-Klingemann