Facile synthesis of 5-amino- and 7-amino-6-azaoxindole derivatives
作者:Nikolay T. Tzvetkov、Christa E. Müller
DOI:10.1016/j.tetlet.2012.07.140
日期:2012.10
An efficient approach for the formation of 5-amino- and 7-amino-6-azaoxindole derivatives was developed. 2-Amino-4-chloro-3-nitropyridine (8), and its 5-nitro-substituted regioisomer (9), respectively, were obtained by reaction with ethylmalonate. The resulting 2-amino-3/5-nitropyridine derivatives substituted in the 4-position with malonic acid diethyl ester (10, 11) were subjected to reductive cyclization