Methyl iodide → 4,5-dihydro-3-(3-methoxy-1-propynyl)-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one

Participants

Reaction Steps

5.05 g (90 mmol) of freshly powdered potassium hydroxide was suspended in 50 ml of N,N-dimethylformamide and cooled to 3°. 6.0 g (22.5 mmol) of 4,5-dihydro-3-(3-hydroxy-1-propynyl)-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one and 6.39 g (45 mmol) of methyl iodide was added thereto in succession, the ice-bath was removed and the mixture was stirred for a further 1 hour. The reaction mixture was poured into 200 ml of water, acidified to pH 7 with 4N hydrochloric acid and extracted five times with methylene chloride. The combined organic extracts were dried over magnesium sulphate, evaporated and after crystallization of the residue from ethyl acetate there was obtained 4,5-dihydro-3-(3-methoxy-1-propynyl)-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one of melting point 114°-115°.

Provenance & Evidence