Ethyl chloroformate → 9-ethoxycarbonylaminomethyl-2-chloro-4-(o-chlorophenyl)-6H-thieno[3,2-f]-s-triazolo[4,3-a][1,4]diazepine

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Reaction Steps

0.6 g of 9-aminomethyl-2-chloro-4-(o-chlorophenyl)-6H-thieno[3,2-f]-s-triazolo[4,3-a][1,4]diazepine are dissolved in 15 ml of absolute dioxane. 1.5 g of potassium carbonate are suspended in the solution and 0.18 g of chloroformic acid ethyl ester added with stirring. After 3 hours, the solid material is filtered off from the solution. The residue obtained after evaporation of the filtrate is recrystallized from ethyl acetate containing active carbon, to yield 9-ethoxycarbonylaminomethyl-2-chloro-4-(o-chlorophenyl)-6H-thieno[3,2-f]-s-triazolo[4,3-a][1,4]diazepine.

Provenance & Evidence