Alkylation of 6-N-Acylated Adenosine Derivatives by the Use of Phase Transfer Catalysis.

6-N- or N1-Alkylation of 6-N-acyl adenosine derivatives with alkyl halides in CH2Cl2–1 mol dm–3 NaOH in the presence of Bu4NBr has been studied. A variety of N-acyl groups have been examined. Consequently, the use of the acetyl and 2-(trimethylsilyl)ethoxycarbonyl groups resulted in the corresponding 6-N-alkylated products in high yields. It was also found that, when the benzoyl group was chosen as the N-acyl group, N1-alkylated products were obtained along with 6-N-alkylated products. The structure of the 6-N- and N1-alkylated adenosine derivatives has been determined by1H And13C NMR spectroscopy.