Synthesis and Antiviral Evaluation of Certain Disubstituted Benzimidazole Ribonucleosides
作者:Ruiming Zou、Kevin R. Ayres、John C. Drach、Leroy B. Townsend
DOI:10.1021/jm960157v
日期:1996.1.1
nzimidazole (10), respectively. Treatment of 10 with thiourea afforded 6-chloro-1-(beta-D-ribofuranosyl)benzimidazole-2-thione (14). Alkylation of 14 with methyl iodide and benzyl bromide gave good yields of the corresponding 2-methylthio (12) and the 2-benzylthio (13) analogs. The synthesis of 6-chloro-2-methoxy-1-(beta-D-ribofuranosyl)benzimidazole (11) was accomplished by the treatment of 2b with
2-氯-5(6)-硝基苯并咪唑(3)的核糖基化得到2-氯-5-硝基-1-(2,3,5-三-O-乙酰基-β-D-呋喃呋喃糖基)苯并咪唑e(4a)和2-氯-6-硝基-1-(2,3,5-三-O-乙酰基-β-D-呋喃呋喃糖基)苯并咪唑e(4b)作为位置异构体的混合物。随后在阮内镍上将该混合物氢化,得到相应的5-氨基和6-氨基衍生物5和6。在这一阶段,产物易于通过硅胶柱色谱分离成纯的异构体形式,并将纯的异构体5和6重氮化。用亚硝酸叔丁酯和氯化铜提供异构体纯的5氯衍生物2a和6氯衍生物2b。用甲醇氨将5、6、2a和2b脱保护,得到游离核苷5-氨基-2-氯-1-(β-D-核呋喃呋喃糖基)苯并咪唑(7),6-氨基-2-氯-1-(β-D-呋喃呋喃糖基)-苯并咪唑(8),2,5-二氯-1-(β-D-呋喃呋喃糖基)苯并咪唑(9)和2,6-二氯- 1-(β-D-呋喃呋喃糖基)苯并咪唑(10)。用硫脲处理10,得到