3-Butyn-2-ol → 7-chloro-4,5-dihydro-3-(3-hydroxy-1-butynyl)-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one

Participants

Reaction Steps

7.47 g (20 mmol) of 7-chloro-4,5-dihydro-3-iodo-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepine-6-one were heated to boiling under reflux for 4 hours with 1.75 g (25 mmol) of 3-butyn-2-ol, 70 mg of bis-(triphenyl -phosphine)-palladium(II) dichloride and 10 mg of copper(I) iodide in 50 ml of diethylamine and 20 ml of ethylene chloride. After evaporation of the solvent the residue was taken up in methylene chloride and the resulting suspension was suction filtered. The material obtained was washed with methylene chloride and, after recrystallization from ethyl acetate, there was obtained 7-chloro -4,5-dihydro-3-(3-hydroxy-1-butynyl)-5-methyl-6H-imidazo -[1,5-a][1,4]benzodiazepin-6-one of melting point 251-252° C.

Provenance & Evidence