Several nucleoside derivatives of pyrimido[4,5-d]pyrimidine-2,4(1H,3H)-dione 1 and 2,41H,3H-pteridinedione 2 were prepared. Treating the appropriate silylated nucleobase with 1-O-acetyl-2,3,5-tri-O-benzoyl-β-D-ribofura-nose 3 in the presence of trimethylsilyl Inflate gave 4 and 8 which, upon debenzoylation, gave 5 and 9, respectively. Treatment of 4 with phosphorus pentasulfide afforded the sulfur
                                    嘧啶的几个核苷衍
生物[4,5- d ]
嘧啶-2,4(1 ħ,3 ħ) -二酮1和2,4- 1 ħ,3 ħ -pteridinedione 2制备。在三甲基甲
硅烷基膨胀酸酯的存在下,用1 - O-乙酰基-2,3,5-三-O-苯甲酰基-β-D-核
呋喃糖-鼻子3处理适当的甲
硅烷基化的核碱基,得到4和8,在脱苯甲酰化后,得到5和分别为9。用五
硫化二
磷处理4得到
硫取代的化合物6。同样,脱保护得到7。通过用甲
硅烷基化的核碱基处理1- O-乙酰基-2,3,5-三-O-苯甲酰基-D-阿拉伯
呋喃糖10得到
阿拉伯糖衍
生物,得到11和13。脱苯甲酰化分别得到游离的阿拉伯核苷12和14。脱氧衍
生物16是通过1与1-
氯-3,5-二-O-乙酰基-2-脱氧-D-
呋喃呋喃糖15反应制备的。用
甲醇氨将16脱乙酰,得到α-端基异构体17。