Benzene, 1-chloro-4-ethynyl- → 3-[(p-chlorophenyl)ethynyl]-8-fluoro-4,5-dihydro-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one

Participants

Reaction Steps

3.6 g (10 mmol) of 8-fluoro-4,5-dihydro-3-iodo-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one was stirred at room temperature for 16 hours with 1.5 g (11 mmol) of p-chlorophenylacetylene, 70 mg of bis-(triphenylphosphine)-palladium(II) dichloride and 15 mg of copper(I) iodide in 35 ml of diethylamine. The reaction mixture was diluted with 175 ml of methylene chloride and washed three times with water. The organic phase was dried over magnesium sulphate and evaporated. By chromatography of the residue on silica gel and subsequent recrystallization from methylene chloride and ethyl acetate there was obtained 3-[(p-chlorophenyl)ethynyl]-8-fluoro-4,5-dihydro-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one of melting point 221°-222°.

Provenance & Evidence