Abstract Treatment of 6-amino-5-arylazo-1, 3-dimethyluracils with ethyl propiolate gave the corresponding Michael-type adducts, 5-arylazo-1, 3-dimethyl-6- ethoxycarbonylvinylaminouracils, which on treatment with a mixture of hydrochloric acid and acetic acid caused the acid-catalyzed rearrangement accompanied with rearrangement to give rise to the corresponding 8-anilinomethyltheophylline derivatives.
![8-[2-(1,3-dimethyl-2,6-dioxo-7H-purin-8-yl)ethyl]-1,3-dimethyl-7H-purine-2,6-dione结构式](https://image.chemsrc.com/caspic/043/1784-67-4.png)
