Fluorinated heterocyclic compounds. 2. 2,4‐difluoro and 4‐amino‐2‐fluoropyrimidines, nucleoside base analogs

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Abstract
Nucleoside base analogs in which fluoro substituents replace the enolic hydroxy groups of uracil, thymine and cytosine have been prepared. Improved methods for the preparation and isolation of the known 2,4‐di‐fluoropyrimidine, 2,4‐difluoro‐6‐methylpyrimidine and the new 2,4‐difluoro‐5‐methylpyrimidine, 2‐fluoro‐4‐aminopyrimidine, 4‐fluoro‐2‐aminopyrimidine, and other alkylaminofluoropyrimidines are described.