Ethyl chloroformate → HCID 178473481, compound

Participants

Reaction Steps

0.45 ml (4 7 mmol) of ethylchloroformate are added dropwise over a period of 10 minutes to a solution of 1 00 g (3.5 mmol) of 6-[2-(3-aminopropyl)-1H-benzimidazol-5-yl]-4,5-dihydro -5-methyl-3(2H)-pyridazinone and 1 25 g (9.0 mmol) of potassium carbonate in 10 ml of acetone and 10 ml of water with cooling in an ice bath. After 3 hours' stirring at room temperature, the reaction mixture is filtered and the filtrate is diluted with 20 ml of water and extracted three times with 20 ml portions of dichloromethane. The combined organic phases are dried and concentrated by evaporation under vacuum and the residue is chromatographed on silica gel with dichloromethane/methanol (9:1) as solvent. The polar main fraction (Rf 0 46) yields 0.65 g (52%) of the title compound in the form of a yellowish, amorphous solid after concentration by evaporation under vacuum.

Provenance & Evidence