Hydrazine hydrate (1:1) → N-[1-(5-Oxo-3-phenyl-4,5-dihydro-1,2,4-triazin-6-yl)ethyl]acetamide

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48 g (306 mmol) of benzenecarboximidamide hydrochloride were dissolved in 1.2 l ethanol, and 16.4 ml (337 mmol) of hydrazine hydrate were added. The mixture was stirred at 45° C. for 3 h. 86 g (459 mmol) of ethyl 3-acetamido-2-oxobutanoate (Example 13A), dissolved in 600 ml of ethanol, were added dropwise. The mixture was stirred at 80° C. for another 6 h and at RT for another 12 h. The reaction mixture was chromatographed on silica gel (mobile phase dichloromethane/methanol 20:1). This gave 23.2 g (26% of theory) of the product as a solid.

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