Acylations of 1,3-dimethyl- (1) and 1,3,7-trimethylpyrrolo[2,3-d]pyrimidine-2,4-dione (2) with anhydrides in the presence of trifluoroacetic acid proceed well to give in good yields the corresponding 7-acyl derivatives 3–11. The 6-trichloroacetyl derivatives 5 and 6 are sensitive towards nucleophiles, which displace the trichloromethyl group easily by formation of the corresponding 6-carboxylic acid
在
三氟乙酸的存在下,用酸酐对1,3-二甲基-(1)和1,3,7-三甲基
吡咯并[2,3- d ]
嘧啶-2,4-二酮(2)进行酰化反应,得到良好的收率。产生相应的7-酰基衍
生物3-11。6-三
氯乙酰基衍
生物5和6对亲核试剂敏感,亲核试剂通过形成相应的6-
羧酸衍
生物12-23容易取代三
氯甲基。新合成的化合物已通过元素分析,紫外和1 H nmr光谱以及p K a的测定进行了表征。