Add time:08/13/2019         Source:sciencedirect.com

Alkylation of 1H-6-methyl-3-phenyl-pyrazolo[5,1-c][1,2,4]triazole and 1H-7-ethoxycarbonyl-6-methyl-3-phenyl-pyrazolo[5,1-c][1,2,4]triazole using different alkylating agents leads regioselectively to 1-N-alkylated products. The hydrolysis–decarboxylation of 1,6-dimethyl-7-ethoxycarbonyl-pyrazolo[5,1-c][1,2,4]triazole yields a compound identical with that obtained by the direct methylation of 1H-6-methyl-3-phenyl-pyrazolo[5,1-c][1,2,4]triazole. The 1-N-alkylation is confirmed by NMR spectroscopy and mass spectrometry.

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