Reactions of 5-chloro-2-methylsulfonyl-4-pyrimidinecarboxylic acid with aliphatic amines afford 2-amino-5-chloro-4-pyrimidinecarboxylic acid, whereas 5-chloro-2-methylsulfonyl-4-pyrimidinecarboxylates form 5-amino-2-methylsulfonyl-4-pyrimidinecarboxylates under the same conditions.
E. V. Blyumin and Y. M. Volovenko, Mendeleev Commun., 2000, 10, 237 DOI: 10.1070/MC2000v010n06ABEH001313
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