Synthesis and biological activity of certain nucleoside and nucleotide derivatives of pyrazofurin
作者:Charles R. Petrie、Ganapathi R. Revankar、N. Kent Dalley、Rose D. George、Patricia A. McKernan、Robert L. Hamill、Roland K. Robins
DOI:10.1021/jm00152a016
日期:1986.2
5'-O-(dimethyl phosphate) (20b) derivatives of pyrazofurin. DCC-mediated cyclization of 17, followed by debenzylation, gave pyrazofurin 3',5'-(cyclic)phosphate (21b). The NAD analogue 23b was also prepared by the treatment of 17 with an activated form of AMP in the presence of AgNO3. The structural assignment of 7,8, and 20a were made by single-crystal X-ray analysis, and along with pyrazofurin, their intramolecular
制备了许多4-羟基-3-β-D-呋喃核糖基吡唑-5-羧酰胺的核苷和核苷酸衍生物(吡唑脲(pyrazofurin,1)),并在细胞培养中测试了它们的抗病毒和细胞抑制活性。用苄基溴处理1,得到4-O-苄基吡唑脲(4)。用CH2N2进行4的甲基化,然后通过催化氢化除去苄基,得到1-甲基吡唑脲(8)。用CH3I对1进行直接甲基化可得到4-O-甲基吡唑脲(6)。用光气将五乙酰基吡唑脲(9)脱水,得到4-乙酰氧基-3-(2,3,5-三-O-乙酰基-β-D-呋喃呋喃糖基)-1-乙酰基吡唑e-5-腈(10)。对4的前体四乙酰基衍生物进行类似的脱水,得到相应的腈,在脱保护并随后用羟胺处理后得到4-(苄氧基)-3-β-D-呋喃核糖基吡唑-5-羧酰胺肟(13)。用Lawesson试剂处理4的四乙酰基衍生物,然后进行脱乙酰作用,得到了4-(苄氧基)-3-β-D-呋喃呋喃糖基吡唑-5-硫代羧酰胺(15)和相应的腈衍