A General Approach toward the Synthesis of <i>C</i>-Nucleoside Pyrazolo[1,5-<i>a</i>]-1,3,5-triazines and Their 3‘,5‘-Bisphosphate C-Nucleotide Analogues as the First Reported in Vivo Stable P2Y<sub>1</sub>-Receptor Antagonists
作者:Pierre Raboisson、Anthony Baurand、Jean-Pierre Cazenave、Christian Gachet、Dominique Schultz、Bernard Spiess、Jean-Jacques Bourguignon
DOI:10.1021/jo026268l
日期:2002.11.1
thylamino)pyrazolo[1,5-a]-1,3,5-triazine (24) with an overall yield of 50% and 39%, respectively. Finally, the conversion of nucleosides 21 and 24 to the pyrazolotriazine C-nucleotides 3',5'-bisphosphate 2 and 3',5'-cyclophosphate 26 is also described herein and represents the first reported nucleotide derivatives within the pyrazolo[1,5-a]-1,3,5-triazine series. Preliminary biological testing has
为了确定有效的嘌呤能P2Y(1)受体拮抗剂作为具有增强的代谢稳定性的有效血小板凝集抑制剂,我们开发了一种大规模制备吡唑并2'-脱氧C核苷的有效途径[1,5- a] -1,3,5-三嗪。这种新颖的合成方法的关键战略要素涉及以下几个方面:(i)使用新颖的活化基团N-甲基-N-苯氨基,通过吡唑并[1,5]可以很容易地以高收率产生它。 -a] -1,3,5-triazin-4-one(5)在高压下与三氯氧磷和二甲基苯胺进行反应,(ii)易位且未受保护的1,4,4-丁二醇的区域和立体定向钯介导的偶联反应脱水-2-脱氧-D-赤-戊-1-烯醇(4b)和8-碘衍生物(16),(iii)呋喃糖基环的酮基的立体选择性还原,随后在用甲胺处理后,将N-甲基-N-苯基氨基取代。在整个转化过程中,糖基部分异头C-1'位置的β构型得以完美保留。该方法提供了8-(2'-脱氧-β-D-呋喃呋喃糖基)-2-甲基-4-(N-甲基氨基)吡唑并[1