Thionyl Chloride → 4-Methylamino-3-[(3-methylisoxazole-5-ylcarbonyl)amino]quinoline

Beteiligte Stoffe

Reaktionsschritte

To a solution of 245 mg of 3-methylisoxazole-5-carboxylic acid in 20 ml of hexamethylphosphoramide and 0.4 ml of acetonitrile is added 226 mg of thionyl chloride at -5°-0° C. After stirring at the same temperature for 30 minutes, 330 mg of 3-amino-4-methylaminoquinoline A15 is added and stirred at 0°-5° C. for 5 hours. The mixture is diluted with 50 ml of ice-water and neutralized with saturated aqueous sodium bicarbonate. The resulting solid is filtered and washed with water to give 361 mg (67%) of 4-methylamino-3-[(3-methylisoxazole-5-ylcarbonyl)amino]quinoline. It is suspended in 4 ml of hexamethylphosphoramide and 1 ml of acetic acid and stirred at 180° C. (bath temperature) for 40 minutes. The cooled mixture is poured into ice-water and neutralized with aqueous sodium bicarbonate. The resulting solid is filtered, washed with water and chromatographed on silica gel with dichloromethane-methanol (25:1 v/v) as eluent. The product obtained is recrystallized from dichloromethane-methanol to give 294 mg of C102 as white crystals melting at 281°-284° C. (dec.).

Herkunft & Nachweise