Stereocontrolled Syntheses of Carbocyclic <i>C-</i>Nucleosides and Related Compounds
作者:Byoung K. Chun、Gyu Y. Song、Chung K. Chu
DOI:10.1021/jo010224f
日期:2001.7.1
Carbocyclic 9-deazapurine nucleosides (1-4), a spiranic pyrimidone carbocyclic compound (5), and an unusual carbocyclic isonucleoside (6) were prepared as enantiomerically pure compounds via the key intermediates 10 and 21 from 1,4-gamma-ribonolactone. The key intermediate 10 was prepared by stereoselective reduction with Bu3SnH and then converted to carbocyclic C-ribonucleosides 1, 3, and 4. 2',3'-Didehydro-2'
通过1,4-γ-核糖内酯的关键中间体10和21,制备了对映体纯的化合物,以对映体纯的形式制备了碳环9-脱氮嘌呤核苷(1-4),螺环嘧啶酮碳环化合物(5)和不寻常的碳环异核苷(6)。通过用Bu3SnH进行立体选择性还原制备关键中间体10,然后将其转化为碳环C-核糖核苷1、3和4。2',3'-Didehydro-2',3'-二脱氧碳环9-脱氮芥子碱(2)的制备通过用Li 2 Te处理然后进行酸性脱保护而得到2′,3′-二甲磺酸酯17。通过使用CHI 3 -Ph 3 P-咪唑的分子内环化,由二醇20制备关键的双环中间体21,并通过杂环部分的构建随后脱保护,将其转化为螺环化合物5和烯烃核苷6。