Dimethylpyridin-4-ylamine-Catalysed Alcoholysis of 2-Amino-N,N,N-trimethyl-9H-purine-6-ylammonium Chloride: An Effective Route to O⁶-Substituted Guanine Derivatives from Alcohols with Poor Nucleophilicity

Abstract

Dimethylpyridin-4-ylamine (DMAP)-catalysed reactions of 2-amino-N,N,N-trimethyl-9H-purine-6-ylammonium chloride with fluoropyridine methoxides and various other alkoxides in DMSO at 60 °C gave the corresponding coupling products in moderate to good yields between 20-87%. Under these reaction conditions, fluorinated O⁶-substituted Guanine derivatives have been synthesized which could not be obtained via known analogous literature procedures. The respective yields of known O⁶-substituted guanine derivatives could be significantly improved by using this method. The efficient use of DMAP as an excellent nucleophilic catalyst in the syntheses of O⁶-substituted Guanine derivatives has thus been demonstrated.

Key words

catalysis - coupling - fluorine - nucleophilic aromatic substitution - pyridines

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