Water → 7-chloro-4,5-dihydro-3-(3-methoxy-3-methyl-1-butynyl)-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one

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Reaction Steps

1.20 g (18.6 mmol) of freshly powdered potassium hydroxide was stirred at room temperature for 5 minutes in 15 ml of dimethyl sulfoxide. 1.65 g (5 mmol) of 7-chloro-4,5-dihydro-3-(3-hydroxy-3-methyl-1-butynyl)-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one and 1.42 g (10 mmol) of methyl iodide were then added thereto in succession, whereby the temperature rises to 35°. The reaction mixture was stirred for 45 minutes and then poured into 50 ml of water. The mixture was extracted five times with methylene chloride, the combined organic phases were dried over magnesium sulphate and evaporated. After crystallization from diisopropyl ether there was obtained 7-chloro-4,5-dihydro-3-(3-methoxy-3-methyl-1-butynyl)-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one of melting point 172°-174°.

Provenance & Evidence