New 4-alkyl- or 4-phenyl-7-methyl-1,2-dihydro-7H-imidazo[1,2,3-cd]purine-6,8-diones 1 were obtained by intramolecular alkylation of 8-alkyl- or 8-phenyl-9-(2-mesyloxyethyl)-1-methyl-9H-purine-2,6(1H,3H)-diones 5. The necessary compounds 5 were prepared from 6-[(2-hydroxyethyl)- amino]-3-methyl-5-nitrosopyrimidine-2,4(1H,3H)-dione (2), which was hydrogenated to 5-amino-6-[(2-hydroxyethyl)amino]-3-methyl derivative 3; consecutive reactions of the latter with an orthocarboxylate and mesyl chloride afforded 8-alkyl- or 8-phenyl-9-(2-hydroxyethyl)-1-methyl-9H-purine- 2,6(1H,3H)-diones 4 and compounds 5, respectively.
通过将8-烷基或8-苯基-9-(2-甲磺氧基乙基)-1-甲基-9H-嘧啶-2,6(1H,3H)-二酮5进行分子内烷基化得到新的4-烷基或4-苯基-7-甲基-1,2-二氢-7H-咪唑并[1,2,3-cd]嘧啶-6,8-二酮1。必要的化合物5是从6-[(2-羟乙基)氨基]-3-甲基-5-亚硝基嘧啶-2,4(1H,3H)-二酮2制备的,该化合物经氢化得到5-氨基-6-[(2-羟乙基)氨基]-3-甲基衍生物3;随后,将后者与一个邻甲酸酯和甲磺酰氯连续反应,分别得到8-烷基或8-苯基-9-(2-羟乙基)-1-甲基-9H-嘧啶-2,6(1H,3H)-二酮4和化合物5。