<i>C</i>-Nucleosides.<b>8</b>. Synthesis of 5-hydroxy-2-(β-D-ribofuranosyl)pyridine
作者:Isamu Maeba、Makoto Suzuki、Naoko Takahashi、Takashi Iijima、Hiroshi Furukawa
DOI:10.1002/jhet.5570250227
日期:1988.3
The synthesis of 5-hydroxy-2-(β-D-ribofuranosyl)pyridine (12) from 2-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)furan (1) is described. Treatment of 1 with α-methoxycarbamate in the presence of p-toluenesulfonic acid in benzene at reflux temperature afforded furfurylcarbamate (2) and its α-isomer in a 5/1 ratio. The anomerization was circumvented by treatment of 1 with α-methoxycarbamate in the presence
描述了由2-(2,3,5-三-O-苯甲酰基-β-D-呋喃呋喃糖基)呋喃(1)合成5-羟基-2-(β-D-呋喃呋喃糖基)吡啶(12)。在对甲苯磺酸存在下于回流温度下在苯中用α-甲氧基氨基甲酸酯处理1,得到糠基氨基甲酸酯(2)及其α-异构体的比例为5/1。通过在室温下在苯中三氟化硼的存在下用α-甲氧基氨基甲酸酯处理1来规避异构化。将化合物2电化学氧化,得到二氢呋喃4。但是,无法将4转换为11。叠氮化物的处理8用溴和甲醇制得9。用锌粉还原9得到二氢糠胺10,产率为80%。用浓盐酸的甲醇溶液处理,得到11,将其用5%氢氧化钠水溶液解封,得到12。