Sodium hydride (NaH) in hexamethylphosphoric triamide (HMPA) has been introduced as an economical and efficient reagent towards the creation of 1,2- or 5,6-enopyranosides from the corresponding halogenated or tosylated pyranosides. NaH/HMPA has several advantages compared to NaH/DMF: elimination products are produced in high yields even from sterically-hindered halides as well as tosylates.
六甲基
磷酸三酰胺(HMPA)中的氢化
钠(NaH)作为一种经济、高效的试剂被引入到从相应的卤代或对
甲苯磺酰基
吡喃糖苷生成 1,2- 或 5,6- 烯
吡喃糖苷的过程中。与 NaH/
DMF 相比,NaH/HMPA 具有以下几个优点:即使从立体受阻的卤化物和
对甲苯磺酸盐中也能生成高产率的消除产物。