First Synthesis of 2,3,4-Tri-<i>O</i>-benzyl-5-thio-<scp>d</scp>-ribono-1,5-lactone
作者:Imane Stasik、Ludovic Chaveriat、Jérôme Lalot、Gilles Demailly、Daniel Beaupère
DOI:10.1055/s-2005-872079
日期:——
The first synthesis of 2,3,4-tri-O-benzyl-5-thio-d-ribono-1,5-lactone was achieved, in five steps, from 5-bromo-5-deoxy-d-ribono-1,4-lactone; displacement of the bromide group, in methyl 2,3,4-tri-O-benzyl-5-bromo-5-deoxy-d-ribonate (7), gave methyl 2,3,4-tri-O-benzyl-5-S-acetyl-5-thio-d-ribonate (10) in 96% yield. Saponification of compound 10 gave the methyl 2,3,4-tri-O-benzyl-5-thio-d-ribonic acid (11) in 98% yield. Treatment of 11 with DIC-HOBt as coupling reagents led, after cyclisation, the target compound, 2,3,4-tri-O-benzyl-5-thio-d-ribono-1,5-lactone (12) in 75% yield.
首次合成2,3,4-三-O-苄基-5-硫代-d-甘露糖内酯,通过五个步骤从5-溴-5-去氧-d-甘露糖-1,4-内酯起始合成。对甲基2,3,4-三-O-苄基-5-溴-5-去氧-d-核糖酸酯(7)的溴化物基团的取代,获得了96%产率的甲基2,3,4-三-O-苄基-5-S-乙酰-5-硫代-d-核糖酸酯(10)。化合物10的皂化反应生成了98%产率的甲基2,3,4-三-O-苄基-5-硫代-d-甘露酸(11)。用DIC-HOBt作为偶联试剂处理11,经过环化后得到目标化合物2,3,4-三-O-苄基-5-硫代-d-甘露糖内酯(12),产率为75%。