Organic-base-catalyzed diversity-oriented synthesis of novel pyrimido[1,2-b]indazole-3-carbonitrile

187A Novel synthesis of pyrimido[1,2-b]indazole-3-carbonitrile has been developed for the first time under mild reaction conditions by employing di-n-butylamine (DBA) as a catalyst and this synthesis follows Group-assisted purification (GAP) chemistry principle.