2-Thio derivatives of dUrd and 5-fluoro-dUrd and their 5'-monophosphates: synthesis, interaction with tumor thymidylate synthase, and in vitro antitumor activity
作者:Maria Bretner、Tadeusz Kulikowski、Jolanta M. Dzik、Malgorzata Balinska、Wojciech Rode、David Shugar
DOI:10.1021/jm00075a016
日期:1993.11
deblocked with MeOH-NH3 to give the desired free anomeric nucleoside pairs 1, 5 and 3, 7, respectively. These were selectively converted to the corresponding 5'-monophosphates 2, 6 and 4, 8, with the aid of the wheat shoot phosphotransferase system. Conformations of the nucleosides 1, 3, 5, 7 are deduced from 1H NMR spectra, and circular dichroism spectra for nucleotide anomeric pairs 2, 6 and 4, 8 are reported
5-氟-2-硫尿嘧啶(11)的方便合成是基于5-氟-2-硫胞嘧啶(9)的水解脱氨基。路易斯酸催化二-TMS-5-氟-2-硫氧嘧啶(13)或二-TMS-2-硫氧嘧啶(14)与2-脱氧-3,5-二-对甲苯基-D-呋喃呋喃糖酰氯的缩合反应(15)生成3',5'-甲苯化2'-脱氧-5-氟-2-硫代尿苷(16和18)或2'-脱氧-2-硫代尿苷(17的β-和α-端基异构体的混合物和19),将它们各自用MeOH-NH 3解封闭,分别得到所需的游离异头核苷对1、5和3、7。在小麦芽磷酸转移酶系统的帮助下,将它们选择性地转化为相应的5'-单磷酸酯2、6和4、8。由1H NMR光谱推导出核苷1、3、5、7的构象,以及核苷酸异头对2的圆二色性光谱2 报告了6和4、8。尽管beta-2-thio-dUMP(4)是一个很好的底物(Km约为10(-5)M),但是beta-5-fluoro-2-thio-dUMP(2)