Scheme 3From: Synthesis and anticancer evaluation of some novel pyrimido[5,4-e][1,2,4]triazines and pyrazolo[3,4-d]pyrimidine using DMF-DMA as methylating and cyclizing agentSynthesis of pyrazolopyrimidines. a = EtOH/rt; b = DMF-DMA/Reflux/1 h; c = DMF-DMA/DMF/Reflux/15 min; d = DMF-DMA/DMF/Reflux/1 h; e = DMF-DMA/Reflux/12 hBack to article page