Diazomethane → HCID 20449998, compound

Participants

Reaction Steps

A solution of 2.65 g of 8-chloro-6-(2-fluorophenyl)-2,4-dihydro-1H-s-triazolo[4,3-a][1]benzazepin-1-one in a mixture of 16 ml of methanol and 16 ml of methylene chloride is treated at 0° with 100 ml of ethereal diazomethane solution. After 3 hours, a further 33 ml of diazomethane solution are added and the mixture is left to stand for a further 2 hours. After evaporation of the solution, the residue is chromatographed on 80 g of silica gel while eluting with chloroform/ethanol (99:1). The crude product is recrystallized from ether/hexane. There is obtained 8-chloro-6-(2-fluorophenyl)-2,4-dihydro-2-methyl-1H-s-triazolo[4,3-a][1]benzazepin-1-one of melting point 142°-143°.

Provenance & Evidence