TY  - BOOK
AU  - Caneppele,D.
AU  - Vieira,P.C.
AU  - Dall'Oglio,E.L.
AU  - Da Silva,L.E.
AU  - Sousa Jr,P.T.
TI  - Unequivocal NMR assignments: O -methoxymethyl esters derivatives of acid chromanones from Calophyllum brasiliense CAMB. (Guanandi)
T2  - Natural Products Research, 22(10), 846-853, 2008
KW  - CALOPHYLLUM BRASILIENSE
KW  - ACID CHROMONONES
KW  - UNEQUIVOCAL NMR ASSIGNMENTS
N1  - Artículo
N2  - The present work describes the fractionation of the crude hexane extract (EBHEX) from Calophyllum brasiliense (Clusiaceae) stem bark. Derivatization of DCM2-9 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 13C and 1 H chemical shifts of compounds 1, 2, and 3
UR  - https://drive.google.com/file/d/1bGWyN0lGXm5OkAtnMMC0VoYX3jWPq1_c/view?usp=drive_link
ER  -