C(O[C:4](=[O:11])[CH2:5][N:6]1[N:10]=[CH:9][CH:8]=[N:7]1)C.O.[NH2:13][NH2:14]>C(O)C>[N:10]1[N:6]([CH2:5][C:4]([NH:13][NH2:14])=[O:11])[N:7]=[CH:8][CH:9]=1As described for example 112a, [1,2,3]triazol-2-yl-acetic acid ethyl ester in ethanol was reacted with hydrazine hydrate (2 equivalents) and the resulting mixture heated under reflux for 3 h. The mixture was cooled to rt and the precipitated product was filtered off and dried to afford the title compound as a white solid (yield: 68%). MS: m/e=141.1 [M]+.
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