Stereoselective Synthesis of the 5‘-Hydroxy-5‘-phosphonate Derivatives of Cytidine and Cytosine Arabinoside
作者:Xuemei Chen、Andrew J. Wiemer、Raymond J. Hohl、David F. Wiemer
DOI:10.1021/jo020483k
日期:2002.12.1
Both the (R)- and (S)-5'-hydroxy 5'-phosphonate derivatives of cytidine and cytosine arabinoside (ara-C) have been prepared via phosphite addition or a Lewis acid mediated hydrophosphonylation of appropriately protected 5'-nucleoside aldehydes. Phosphite addition to a cytosine aldehyde protected as the 2',3'-acetonide gave predominately the 5'R isomer, while phosphite addition to the corresponding
胞苷和胞嘧啶阿拉伯糖苷(ara-C)的(R)-和(S)-5'-羟基5'-膦酸酯衍生物均通过亚磷酸酯加成或路易斯酸介导的适当保护的5'-核苷醛进行氢膦酰化而制得。亚磷酸酯被添加到作为2',3'-丙酮化物保护的胞嘧啶醛中,主要生成5'R异构体,而亚磷酸酯添加到相应的2',3'-bis TBS衍生物则有利于5'S立体化学。相反,亚磷酸酯加到由ara-C衍生的2',3'-双TBS保护的醛中仅得到5'R加合物。但是,相同的ara-C醛的TiCl(4)介导的氢膦酰化作用以2:1的比例有利于5'S立体异构体。一旦所有四个非对映异构体都存在,这些化合物的立体化学可根据其光谱数据或从其O-甲基扁桃酸酯衍生物获得。在膦酸酯和各种保护基水解后,测试了四种α-羟基膦酸作为核苷单磷酸激酶底物的能力以及对K562细胞的毒性。