2‐Methylthio‐7‐desazainosin und sein α‐Anomer — Debenzylierung von Thionucleosiden mit Bortrichlorid

2‐Methylthio‐7‐deazainosine and its α‐Anomer — Debenzylation of Thionucleosides with Boron Trichloride Debenzylation of the sugar moiety of pyrrolo[2,3‐ d ]pyrimidine nucleosides without affecting methoxy or methylthio substituents of the chromophore has been accomplished by the action of boron trichloride/dichloromethane at — 78°C. Applying this method to the protected derivatives 1b or 2b the methylthio nucleosides 3 and 4 were obtained in high yields.