K. Sujino et H. Sugimura, STEREOCONTROLLED SYNTHESIS OF BETA-D-2'-DEOXYRIBONUCLEOSIDES BY INTRAMOLECULAR GLYCOSYLATION, Chemistry Letters, (7), 1993, pp. 1187-1190
Intramolecular glycosylation of phenyl 2-deoxy-5-O-(2-pyridyl)- and -O
-(4-methoxy-2-pyrimidyl)-l-thio-D-ribofuranoside by activation with di
methyl-(methylthio)sulfonium tetrafluoroborate followed by hydrolysis
gave the corresponding beta-2'-deoxyribonucleoside derivatives in good
yields.