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Unequivocal total assignment of 13C and 1H NMR spectra of some pyrido[1,2-a]pyrimidine derivatives by 2D-NMR

✍ Scribed by Krishan A. Suri; Om P. Suri; Musarat Amina; Basant P. Wakhloo; Naresh K. Satti

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
80 KB
Volume
41
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

We report the total assignments of the ^13^C and ^1^H NMR spectra of some 4‐methyl‐2‐oxo‐(2__H__)‐pyrido[1,2‐a]pyrimidine and 2‐methyl‐4‐oxo‐(4__H__)‐pyrido[1,2‐a]pyrimidine derivatives. The products were characterized by ^1^H and ^13^C NMR and reported data for similar compounds. No comparative data for the two sets of isomeric compounds with respect to ^13^C and ^1^H NMR have been reported to date. We made some detailed studies of the 2D NMR spectra of these compounds and observed that assignments made for non‐protonated carbon atoms by us and those reported in the literature for similar compounds need correction. The revised assignments were made on the basis of heteronuclear single quantum correlation (HSQC) and heteronuclear multiple bond correlation (HMBC) techniques. Copyright © 2003 John Wiley & Sons, Ltd.

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