The synthesis of 4-alkylsulphonyl-5-amino- and 5-amino-4-phosphono-imidazole nucleosides as potential inhibitors of purine biosynthesis
作者:J. Grant Buchanan、Avril E. McCaig、Richard H. Wightman
DOI:10.1039/p19900000955
日期:——
Conversion of 4(5)-methylthio-5(4)-nitroimidazole (11) into its silyl derivative and subsequent condensation with 1-O-acetyl-2,3,5-tri-O-benzoyl-β-D-ribofuranose (9) in the presence of trimethylsilyl trifluoromethanesulphonate for a short reaction time gave 4-methylthio-5-nitro-1-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)imidazole (15) with high regioselectivity; use of longer reaction times gave predominantly
将4(5)-甲硫基-5(4)-硝基咪唑(11)转化为其甲硅烷基衍生物,然后与1 - O-乙酰基-2,3,5-三-O-苯甲酰基-β - D-呋喃呋喃糖缩合(9)在三氟甲磺酸三甲基甲硅烷基酯存在下短时间反应,得到具有高区域选择性的4-甲硫基-5-硝基-1-(2,3,5-三-O-苯甲酰基-β - D-呋喃呋喃糖基)咪唑(15) ; 使用更长的反应时间主要得到了5-甲硫基-4-硝基-异构体(14)。从(15)获得5-氨基-4-甲基磺酰基-1-β- D-呋喃呋喃糖基)咪唑(7))分为三个步骤。