5-Substituted <i>N</i><sup>4</sup>-Hydroxy-2‘-deoxycytidines and Their 5‘-Monophosphates: Synthesis, Conformation, Interaction with Tumor Thymidylate Synthase, and in Vitro Antitumor Activity
作者:Krzysztof Felczak、Agnieszka Miazga、Jarosław Poznański、Maria Bretner、Tadeusz Kulikowski、Jolanta M. Dzik、Barbara Gołos、Zbigniew Zieliński、Joanna Cieśla、Wojciech Rode
DOI:10.1021/jm000975u
日期:2000.11.1
procedures are described for the synthesis of 5-substituted N(4)-hydroxy-2'-deoxycytidines 5a,b,d-h via transformation of the respective 5-substituted 3', 5'-di-O-acetyl-2'-deoxyuridines 1a-c,e-h. These procedures involved site-specific triazolation or N-methylimidazolation at position C(4), followed by hydroxylamination and deblocking with MeOH-NH(3). Nucleosides 5a,b,d-h were selectively converted
描述了通过转化各自的5-取代的3',5'-二-O-乙酰基-2'-来合成5-取代的N(4)-羟基-2'-脱氧胞苷5a,b,dh的简便方法。脱氧尿苷1a-c,eh。这些程序包括在位置C(4)上进行位点特异性三唑基化或N-甲基咪唑基化,然后进行羟胺化并用MeOH-NH(3)进行解封。借助于麦芽磷酸转移酶系统,将核苷5a,b,dh选择性地转化为相应的5′-单磷酸酯6a,b,dh。由(1)H NMR光谱推导并通过分子力学计算证实的D(2)O溶液中每个核苷的构象表明,戊糖环主要存在于构象S(C-2'-endo)和N( 4)-OH基为顺式旋转异构体。研究了两种L5178Y鼠白血病细胞系对亲本和5-氟-2'-脱氧尿苷(FdUrd)的耐药性对细胞生长的抑制作用,后者对FdUrd的敏感性比前者低70倍。对于耐FdUrd的L5178Y细胞,5-氟-N(4)-羟基-2'-脱氧胞苷(5e)引起的生长抑制作用几乎是F