7-Functionalized 7-deazapurine β-d and β-l-ribonucleosides related to tubercidin and 7-deazainosine: glycosylation of pyrrolo[2,3-d]pyrimidines with 1-O-acetyl-2,3,5-tri-O-benzoyl-β-d or β-l-ribofuranose

7-Functionalized 7-deazapurine β-d and β-l-ribonucleosides related to tubercidin and 7-deazainosine.