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  • Title: Unequivocal NMR assignments: O-methoxy-methyl esters derivatives of acid chromanones from Calophyllum brasiliense CAMB. (Guanandi).
    Author: Caneppele D, Vieira PC, Dall'Oglio EL, da Silva LE, Sousa PT.
    Journal: Nat Prod Res; 2008; 22(10):846-53. PubMed ID: 18626818.
    Abstract:
    The present work describes the fractionation of the crude hexane extract (EBHEX) from Calophyllum brasiliense (Clusiaceae) stem bark. Derivatization of DCM(2-9) fraction with diazomethane afforded the chromanones inophylloidic acid, isobrasiliensic acid, as well as, a mixture containing isobrasiliensic and brasiliensic acids, in the form of their more stable O-methoxy-methyl esters derivatives 1, 2, and 3, respectively. The isolation of 1 from C. brasiliense is described for the first time herein. The use of two-dimensional NMR methods ((1)H-COSY, HMQC, and HMBC) allowed the precise determination of (13)C and (1)H chemical shifts of compounds 1, 2, and 3.
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