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 Sonogashiracoupling reactions in the presence of Pd catalysts to give carbohydrate-derivedenynes 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 Sonogashiracoupling, leading to 2-deoxyenynes.
Sonogashiracoupling of bromo or iodo-exo-glycals, readily prepared from 1-exo-methylene furanoses and pyranoses, provides an efficient entry to furanose- and pyranose-derived enyne and ene-diyne moieties found in biologically relevant structures.