arboxylate (8). Further ammonolysis of 8 or 7 at elevated temperature and pressure gave 5-methyl-1-beta-D-ribofuranosylimidazole-4-carboxamide (9). All of these ribonucleosides were tested in Vero cell cultures and in mice against certain viruses. Compounds 3a and 3c exhibited significant activity against vaccinia virus in vitro, whereas 4a was effective against Rift Valley fever virus in mice. 5-Thiobredinin
制备了许多5-取代的
咪唑-4-羧酰胺
核糖核苷,并对其
生物学活性进行了测试。用
甲硫醇处理5-
氯-1-β-D-
呋喃基
呋喃基
咪唑-4-羧酰胺(2),得到5-(甲
硫基)-1-β-D-
呋喃基
呋喃基
咪唑-4-羧酰胺(3a)。用
乙硫醇或苯甲
硫醇类似地处理2,得到相应的5-乙
硫基和5-苄
硫基衍
生物3b和3c。用
间氯过氧苯甲酸氧化3a和3b得到相应的磺酰基衍
生物4a和4b。用
萘钠或Na / NH 3还原性裂解3c,得到5-巯基-1-β-D-
呋喃呋喃基
嘧啶基
咪唑-4-羧酰胺(5-
硫代bredinin,5)。用氢
硫化
钠直接处理2提供了到5的替代途径,其结构是通过单晶X射线分析确定的。5-
硫代布雷丁宁具有与布雷丁丁相似的两性离子结构。在SnCl4存在下,使用1-O-乙酰基-2,3,5-三-O-苯甲酰基-D-
呋喃呋喃糖将5(4)-甲基
咪唑-4(5)-
羧酸乙酯(6)的
硅烷化的糖基化提供了定量在室温下用MeOH / NH