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5-Alkylamino derivatives of tetrazolo[1,5-a]quinazoline were obtained with high regioselectivity in the reaction of 5-azidotetrazolo[1,5-a]quinazoline (formally, 2,4-diazidoquinazoline) with long chain alkylamines. The obtained 5-aminoquinazoline derivatives were used in a copper catalyzed azide-alkyne 1,3-dipolar cycloaddition reaction to obtain series of 4-(alkylamino-2-(1,2,3-triazol-1-yl)quinazolines.

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