Mitsunobu反应简便合成呋喃糖基苯并咪唑C-核苷

Concise Synthesis of Furanosyl Benzimidazole C-Nucleosides by Mitsunobu Reaction

以不保护的五、六元单糖与邻苯二胺反应,得到中间体多羟基链苯并咪唑.进一步,利用Mitsunobu反应,分子内脱水合成了构型翻转和构型保持的呋喃糖基苯并咪唑C-核苷. Mitsunobu反应良好的区域选择性,为呋喃糖基苯并咪唑C-核苷的合成提供一个有效方法.

Tetri/pentitolyl benzimidazoles were prepared by using the unprotected monosaccharides and o-phenylenediamine as the starting materials. Intramolecular dehydration of the oligotoltyl benzimidazoles afforded two furanosyl benzimidazole C-nucleosides(α/β isomers) through Mitsunoble reaction. One isomer was the configuration-retension product, the other was the configuration-inversion one. The regioselectivity of Mitsunobu reaction is good, which provides an effective protocol for the synthesis of furanosyl benzimidazole C-nucleosides.