An Efficient Method for the Iodination of C5-Position of Dialkoxy Pyrimidines and Uracil Bases1,2

Abstract
N-Iodosuccinimide in trifluoroacetic acid and trifluoroacetic anhydride was found to be an excellent reagent for the conversion of 2,4-dialkoxy pyrimidines to 2,4-dialkoxy-5-iodopyrimidines. Iodination at C5-position of uracil and its derivatives was also accomplished with the above reagent.