Reagents Guanidine, Cyanogen Bromide, or S-Methylisothiourea

A similar reaction was accomplished with cyanogen bromide. When the appropriate N-alkyl-4-amino-5-aminomethyl-1,2,3-triazoles were refluxed with cyanogen bromide in methanol, 2-amino-1-methyl-, 2-methyl-, and 3-benzyltriazoles were obtained in 40-75% yields.66 

2-Aminobenzylamine and dicyanamide, boiled in water, produced 2-guanidino-3,4-dihydroquinazoline (71).67 

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