Nucleophilic substitution of 3,7-dimethyl-6-methylthio-2-oxopurine (1)  with alcoholates or carbanions of active methylene compounds affords  the corresponding 6-alkoxy- or 6-alkylidene-3,7-dimethyl-2-oxopurines,  respectively, in good yields.
                                    3,7-二甲基-6-甲
硫基-2-氧代
嘌呤(1)与活性亚甲基化合物的醇酸酯或碳化物进行亲核取代,可分别得到相应的 6-烷氧基或 6-亚烷基-3,7-二甲基-2-氧代
嘌呤,产率良好。