N ⁶-Acetyl-2′,3′,5′-tri-O-acetyladenosine; A Convenient, ‘Missed Out’ Substrate for Regioselective N⁶-Alkylations

Abstract

A simple and efficient route to N ⁶-acetyl-2′,3′,5′-tri-O-acetyladenosine (1) was developed based on selective N-deacetylation of pentaacetylated adenosine 2 with methanol at room temperature in the presence of imidazole. Preparative synthesis of 1 was elaborated utilizing a crude mixture of 2 and 1 which is produced by reaction of adenosine with acetic anhydride in pyridine at elevated temperatures. The total yield of 1 was 80-85% starting with adenosine. It was shown that 1 is a convenient substrate for selective N⁶-alkylations. The study revealed the same regioselectivity in base-promoted reactions of 1 with activated alkyl halides and Mitsunobu reactions of 1 with alcohols. A series of N ⁶-alkyladenosines 5a-f were prepared. Cytokinins 6b,d,e were prepared by enzymatic transformation of parent nucleoside derivatives 5b,d,e using a combination of nucleoside phosphorylase and alkaline phosphatase.

Key words

cytokinins - adenosine derivatives - N⁶-alkylation - regioselectivity­ - Mitsunobu reaction - nucleoside phosphorylase

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