Reaction of acetyl hypofluorite with pyrimidines. Part 3. Synthesis, stereochemistry, and properties of 5-fluoro-5,6-dihydropyrimidine nucleosides
作者:Gerard W. M. Visser、Renella E. Herder、Paul Noordhuis、Oene Zwaagstra、Jacobus D. M. Herscheid、Frans J. J. de Kanter
DOI:10.1039/p19880002547
日期:——
The reaction of acetylhypofluorite (AcOF) with unprotected uracil and cytosine nucleosides in acetic acid or water has been studied using 18F as a tracer. For the nucleosides in general two cis-diastereoisomers of both the 6-acetoxy-5-fluoro and 5-fluoro-6-hydroxy adducts were obtained, 1H n.m.r. analysis of which showed that they all possessed the anti-conformation. The 6-acetoxy-5-fluoro adducts
使用18 F作为示踪剂,研究了乙酰基次萤石(AcOF)与未保护的尿嘧啶和胞嘧啶核苷在乙酸或水中的反应。对于核苷,通常获得6-乙酰氧基-5-氟和5-氟-6-羟基加合物的两个顺式-非对映异构体,其1 H nmr分析表明它们都具有反构象。尿嘧啶核苷的6-乙酰氧基-5-氟加合物显示出显着的稳定性,并且似乎是令人感兴趣的通用化合物。它们可以转化为迄今未知的相应的5-氟-6-羟基-O 6。,5'-脱水环尿嘧啶核苷。对于胞嘧啶核苷,未观察到6-乙酰氧基-5-氟加合物,而发现其他胞嘧啶加合物在水中以C-4迅速脱氨基,产生相应的尿嘧啶类似物。有趣的是,即使在一对非对映异构体中,也观察到了不同的脱氨速率。