The hypothesis of tautomeric equilibrium between epimers in ciquitins A and B.
J Asian Nat Prod Res
; 24(11): 1052-1057, 2022 Nov.
Article
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| MEDLINE
| ID: mdl-34871119
ABSTRACT
Recently, ciquitins A and B isolated from the powdered and defatted airdried aerial parts of Leucophyllum ambiguum were reported as a mixture of conformers in a solution at room temperature. Considering the existence of a hemiacetal hydroxyl fragment in the ciquitins A and B, they are more likely to exist in the form of epimer rather than the mixture of conformers. To confirm this hypothesis, the NMR calculations of two epimers at C-9 (1-a and 1-b) were performed and the results matched well with experimental NMR data of mixtures (1). Moreover, a brief discussion on the reason for this hypothesis was also presented.
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01-internacional
Base de dados:
MEDLINE
Assunto principal:
Scrophulariaceae
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article