反应详情

To 1-(4-bromo-phenyl)-3-cyclopropyl-6,8-dimethyl-5-phenylamino-1H,8H-pyrido[2,3-d]pyrimidine-2,4,7-trione 41 (78 mg) obtained in Step 7 was added chloroform-methanol [1:1 (volume ratio), 2.0 ml], potassium carbonate (22 mg) was added, and the mixture was stirred at room temperature for 10 hrs. The mixture was further stirred under reflux for 3 hrs, and allowed to cool to room temperature. The mixture was concentrated under reduced pressure and purified by column chromatography (chloroform:acetone=50:1) to give 5-(4-bromo-phenylamino)-3-cyclopropyl-6,8-dimethyl-1-phenylamino-1H,6H-pyrido[4,3-d]pyrimidine-2,4,7-trione 42 (23 mg, yield 26%) as colorless crystals.

1. additionwas added
2. stirringThe mixture was further stirred
3. temperatureunder reflux for 3 hrs
4. temperatureto cool to room temperature
5. concentrationThe mixture was concentrated under reduced pressure
6. custompurified by column chromatography (chloroform:acetone=50:1)