Synthesis of C-ribosyl 1,2,4-triazolo[3,4-f ][1,2,4]triazines as inhibitors of adenosine and AMP deaminases
作者:Philip J. Dudfield、Van-Duc Le、Stephen D. Lindell、Charles W. Rees
DOI:10.1039/a905177e
日期:——
Modified C-nucleosides and nucleotides with an enhanced tendency to undergo covalent hydration are of interest as potential inhibitors of adenosine deaminase (ADA) and AMP deaminase, respectively. In a search for such compounds we have synthesized 6-dimethylamino-3-(β-D-ribofuranosyl)-1,2,4-triazolo[3,4-f][1,2,4]triazine 4 in four steps (42% overall yield) from the readily available allonic acid 6 and the hydrazine 7. The hydrazide 16 derived from 6 and 7 (78%) is converted directly into the cyclised chloro compound 19 (62%) with phosphorus trichloride oxide, followed by dechlorination (96%) and deprotection (90%). Riboside 4 undergoes partial hydration in water to the covalent hydrate 22, and is a modest inhibitor of mammalian ADA (IC50 180 µM).
具有增强共价水化倾向的改良C-核苷和核苷酸,分别作为腺苷脱氨酶(ADA)和AMP脱氨酶的潜在抑制剂,具有研究价值。在寻找此类化合物的过程中,我们通过四步反应(总产率42%)从易获得的别二酮酸6和肼7合成了6-二甲氨基-3-(β-D-呋喃核糖基)-1,2,4-三唑并[3,4-f][1,2,4]三嗪4。由6和7衍生的酰肼16(产率78%)与磷酰三氯直接反应生成环化氯化合物19(产率62%),随后经脱氯(产率96%)和脱保护(产率90%)得到目标产物。核苷4在水中部分水化为共价水合物22,并能适度抑制哺乳动物腺苷脱氨酶(IC50为180 µM)。