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1H and 13C NMR studies of the protonation of isomeric methoxysulmazole analogues

✍ Scribed by J. C. Lindon; J. M. Williams; P. Barraclough; W. R. King; M. S. Nobbs

Publisher: John Wiley and Sons
Year: 1990
Tongue: English
Weight: 279 KB
Volume: 28
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260280703

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✦ Synopsis

Abstract

The major protonation sites of six cardiotonic isomeric 2‐aryl‐n‐methoxy‐1__H__‐imidazo[4,5‐b]‐ and ‐[4,5‐c]‐pyridines (n = 4–7) were determined by ^1^H and ^13^C NMR methods. All the 1__H__‐imidazo[4,5‐c]pyridines and the 7‐methoxy derivative of sulmazole were found to protonate at the pyridyl nitrogen. Protonation occurred at the imidazo nitrogen, however, for the 5‐ and 6‐methoxy derivatives of sulmazole.

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