Nucleosides and Nucleotides. 232. Synthesis of 2′-<i>C</i>-Methyl-4′-thiocytidine: Unexpected Anomerization of the 2′-Keto-4′-thionucleoside Precursor
作者:Daisuke Kaga、Noriaki Minakawa、Akira Matsuda
DOI:10.1080/15257770500267204
日期:2005.9.1
The synthesis of 2′-C-methyl-4′-thiocytidine (16) is described. Since the 2′-keto-4′-thiocytidine derivative 2β unexpectedly isomerized to 2α and the methylation of 2β proceeded predominantly from the less hindered α-face to give 7, the desired product 16 was synthesized via the Pummerer reaction of the sulfoxide 14 and N 4 -benzoylcytosine.
描述了 2'-C-
甲基-4'-
硫胞苷 (16) 的合成。由于 2'-
酮基-4'-
硫胞苷衍
生物 2β 出乎意料地异构化为 2α 并且 2β 的
甲基化主要从受阻较小的 α 面进行得到 7,因此通过
亚砜 14 和N 4 -
苯甲酰
胞嘧啶。