Efficient synthesis of exomethylene- and keto-exomethylene-d-glucopyranosyl nucleoside analogs as potential cytotoxic agents
作者:Niki Tzioumaki、Evangelia Tsoukala、Stella Manta、Christos Kiritsis、Jan Balzarini、Dimitri Komiotis
DOI:10.1016/j.carres.2010.10.019
日期:2011.2
afford 1-(3'-deoxy-4',6'-O-isopropylidene-3'-methylene-beta-d-glucopyranosyl)pyrimidines 7a-c. Oxidation of the free hydroxyl group in the 2'-position of the sugar moiety led to the formation of the labile 1-(3'-deoxy-4',6'-O-isopropylidene-3'-methylene-beta-d-glucopyranosyl-2'-ulose)py rimidines 8a-c. Finally, deisopropylidenation of the resulted derivatives 8a-c afforded the diol nucleosides 9a-c. The
设计并合成了一系列以胸腺嘧啶,尿嘧啶和5-氟尿嘧啶为杂环碱基的新系列的exomethyl-和keto-exomethyl-d-glucopyranonucleosides。3-酮葡萄糖苷1的Wittig缩合得到相应的1,2:5,6-二-O-异亚丙基-3-脱氧-3-亚甲基-d-葡萄糖呋喃糖(2),其在水解和乙酰化后形成前体1,2,4,6-四-O-乙酰基-3-脱氧-3-亚甲基-d-吡喃葡萄糖(4)。将化合物4分别与甲硅烷基胸腺嘧啶,尿嘧啶和5-氟尿嘧啶缩合,脱乙酰基和缩醛化,得到1-(3'-脱氧-4',6'-O-异亚丙基-3'-亚甲基-β-d-吡喃葡萄糖基嘧啶7a-c。糖部分2'-位的游离羟基被氧化导致不稳定的1-(3'-脱氧-4',6'-O-异亚丙基-3'形成 -亚甲基-β-d-吡喃葡萄糖基-2'-ulose)py嘧啶8a-c。最终,所得衍生物8a-c的脱异丙基亚胺化得到二醇核苷9a-c。目