1H-Pyrimido[5,4,3-kl]phenothiazine-1,3(2H)-diones are prepared from the corresponding 1-thione-3-one compounds by methylation followed by acid hydrolysis. The 1,3-dione products and 1-thione-3-one intermediates are useful as anti-arthritic agents.
1H-Pyrimido[5,4,3-kl]phenothiazine-1,3(2H)-二酮是通过对应的1-
硫代-3-酮化合物进行甲基化,然后进行酸
水解制备而成的。1,3-二酮产物和1-
硫代-3-酮中间体可用作抗关节炎药物。