Synthesis ofN-(5-Aminopyrazol-3-yl)amino andN(5-Amino-1,2,4-triazol-3-yl)amino Acids

Abstract

Some N-(5-aminopyrazol-3-yl) and N-(5-amino-1,2,4-triazol-3-yl) derivatives of amino acids or dipeptides are synthesized in good yields from the reaction of α-(aminocarbonyl)-α-cyanoketene dithioacetals with amino acid or dipeptide tert-butyl esters and cyclocondensation of the resultant α-(aminocarbonyl)-α-cyanoketene S,N-acetals [N-(2-aminocarbonyl-2-cyano-1-methylthioethenyl)amino acid derivatives] with hydrazine hydrate.