Structure of the cationic forms of pyrimido [4,5-b][1,4]thiazines — A new type of folic acid antagonist

Autor: Dvoryantseva, G. G., Ul'yanova, T. N., Filipenko, T. Ya., Nemeryuk, M. P., Safonova, T. S., Sheinker, Yu. N., Petrovskii, P. V., Fedin, É. I.
Zdroj: Chemistry of Heterocyclic Compounds; January 1979, Vol. 15 Issue: 1 p41-46, 6p
Abstrakt: The protonation of 4-methoxy-, 4-amino-, and 4-dimethylamino-6-aminopyrimido[4,5-b][1,4]thiazines and N-(4-methoxy-5-pyrimidinyl)acetamidine was studied by 1H and 13C NMR spectroscopy. It is shown that the addition of a proton in the first three compounds takes place at the N5 atom of the thiazine ring, whereas in the case of N-(4-methoxy-5-pyrimidinyl) acetamidine primary protonation is observed at the nitrogen atom of the amidine group, and the second proton adds to the N1 atom of the pyrimidine ring.
Databáze: Supplemental Index
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