2-Methoxyacetohydrazide → 1-(methoxymethyl)-6-phenyl-8-chloro-4H-s-triazolo[4,3-a][1,4]benzodiazepine

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Reaction Steps

A solution of 10.0 g of 2-(methylthio)-5-phenyl-7-chloro-3H-1,4-benzodiazepine and 4.85 g of 2-methoxyacetic acid hydrazide (cp. E. J. Browne and J. B. Polya, J.Chem.Soc. 1962, 5149-5152) in 70 ml of abs. hexamethylphosphoric acid triamide is heaated for 11 hours at 140°. The solvent is then distilled off in vacuo. The residue is taken up in methylene chloride; the solution is washed with water and then with saturated sodium chloride solution, dried over sodium sulphate, and concentrated by evaporation. Crystallisation of the concentration residue from ethyl acetate/petroleum ether yields 1-(methoxymethyl)-6-phenyl-8-chloro-4H-s-triazolo[4,3-a][1,4]benzodiazepine, M.P. 185°-191°. After chromatography of the mother liquor on 100 g of silica gel "Merck", a further amount of final product of the same melting point can be isolated.

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