Co- and homocyclotrimerization reactions of protected 1-alkynyl-2-deoxyribofuranose. Synthesis of C-nucleosides, C-di- and C-trisaccharide analogues

(2-Deoxy-d-ribofuranose-1-yl)alkynes undergo cyclotrimerizations with diynes to benzene derivatives under Rh or Ru-catalysis and microwave irradiation.