The synthesis of 6, 3'-methanouridine was achieved by condensation of 2, 4-dimethoxy-6-lithiomethylpyrimidine with 5-O___--(tert-butyldi-methyl)silyl-1, 2-O___--isopropylidene-3-ketoxylose, followed by intramolecular glycosylation and deprotection. 6, 3'-Methanocytidine was also prepared from the 4-O___--methyl intermediate. The title compounds are the first example of uridine and cytidine fixed between C-6 and the 3'-position of pyrimidine nucleosides by a methylene group.
通过 2,4-二甲氧基-6-
硫代
甲基嘧啶与 5-O____-(叔丁基二甲基)
硅-1,2-O____-异亚丙基-3-酮氧基lose 缩合,然后进行分子内糖基化和脱保护,合成了 6,3'-甲
氰尿苷。6,3'-甲
氰胞苷也是由 4-O___-甲基中间体制备的。标题化合物是
尿苷和
胞苷通过亚甲基固定在
嘧啶核苷的 C-6 和 3'- 位之间的第一个实例。