Abstract
β-D-Ribofuranosides are stereoselectively synthesized in high yields directly from 2,3,5-tri-O-benzyl-D-ribofuranose and trimethylsilylated nucleophiles by the use of [catecholato(2−)-O,O′ ]oxotitanium and trifluoromethanesulfonic anhydride, while α-D-ribofuranosides are prepared predominantly in high yields in the coexistence of lithium perchlorate.