1,2-Dimethylhydrazine dihydrochloride → HCID 18442536, Verbindung

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of intermediate 3, ethyl 5-benzyloxy-1-(methoxycarbonylmethyl)-2-(methylsulfonyl)-6-oxo-1,6-dihydropyrimidine-4-carboxylate, (0.487 g, 1.15 mmol) in N,N-dimethylformamide (25 ml) was treated with 1,2-dimethylhydrazine dihydrochloride (1.56 g, 11.7 mmol) followed by N,N-diisopropylethylamine (4.1 ml, 11.7 mmol) and the resulting mixture stirred at 22° C. for 4 h. The solvent was then removed in vacuo and the residue diluted with ethyl acetate, washed successively with saturated sodium bicarbonate and brine then dried over anhydrous magnesium sulfate. Evaporation of the solvent followed by chromatography on silica gel (elution with a gradient of ethyl acetate 0–50% in toluene) gave 0.294 g (69% yield) of the title ester as a clear syrup.

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