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Quaternization of pyrido[2,3-b]pyrazines: 1H and 13C NMR Study (1985)

Chupakhin, O. N. ; Charushin, V. N. ; Chernyshev, A. I. ; [et al.]

Chichester : Wiley-Blackwell

Organic Magnetic Resonance 23 (1985), S. 437-441

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ISSN: 0749-1581

Keywords: Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The structure of N-methylpyrido[2,3-b]pyrazinium salts has been examined by 1H and 13C NMR. 6-Dimethylamino- and 6-morpholino-pyrido[2,3-b]pyrazines were shown to undergo quaternization by methyl iodide at N-4 of the pyrazine ring, whereas the pyridine ring N-5 was the N-alkylation site in the reaction of unsubstituted pyrido[2,3-b]pyrazine with methyl iodide under the same conditions. The effects of quaternization on the 1H and 13C chemical shifts and the nJ(CH) values are discussed.

Additional Material: 4 Tab.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/mrc.1260230607

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