Sonogashira Couplings of Halo- and Epoxy-Halo-exo-Glycals: Concise Entry to Carbohydrate-Derived Enynes
作者:Ana M. Gómez、Aitor Barrio、Ana Pedregosa、Clara Uriel、Serafín Valverde、J. Cristóbal López
DOI:10.1002/ejoc.201000170
日期:2010.5
and pyranose-derived mono- and dihalo-exo-glycals undergo Sonogashira coupling reactions in the presence of Pd catalysts to give carbohydrate-derived enynes in a completely stereoselective manner. On the other hand, a furanose-derived 2,3-anhydrohalo-exo-glycal, available from D-mannose in five steps, undergoes Pd0-catalyzed Sonogashira coupling, leading to 2-deoxyenynes.
在 Pd 催化剂存在下,呋喃糖和吡喃糖衍生的单和二卤代外糖醇发生 Sonogashira 偶联反应,以完全立体选择性的方式得到碳水化合物衍生的烯炔。另一方面,呋喃糖衍生的 2,3-脱水卤代外糖基,可通过五步从 D-甘露糖中获得,经过 Pd0 催化的 Sonogashira 偶联,产生 2-脱氧炔。