Methanol → 5-[1-Cyclopropylcarbonyloxy-2-(3,4-dimethoxyphenethylamino)ethyl]-8-cyclopropylcarbonyloxycarbostyril hydrochloride

Beteiligte Stoffe

Reaktionsschritte

2 ml of cyclopropanecarboxylic acid and 1 ml of cyclopropanecarboxylic acid chloride were added to 500 mg of 5-[1-hydroxy-2-(3,4-dimethoxyphenethylamino)ethyl]-8-hydroxycarbostyril hydrochloride, and the mixture was allowed to react for 1 hour at a temperature of 80° C. After completion of the reaction, 10 ml of methanol was added to the reaction mixture while cooling with ice-water followed by addition of diethyl ether to crystallize the product. The crystals thus obtained were separated by filtration, washed with diethyl ether and recrystallized from a mixture of ethanol and acetone to obtain 210 mg of 5-[1-cyclopropylcarbonyloxy-2-(3,4-dimethoxyphenethylamino)ethyl]-8-cyclopropylcarbonyloxycarbostyril hydrochloride having a melting point of 167°-168° C. (with decomposition).

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