Studies on naphthoic acid esters from the roots of Rubia cordifolia L
Hua, H.M.; Wang, S.X.; Wu, L.J.; Li, X.; Zhu, T.R.
Yao Xue Xue Bao 27(4): 279-282
1992
ISSN/ISBN: 0513-4870 PMID: 1442042 Document Number: 395990
Four naphthoic acid esters including a new compound were isolated from the roots of Rubia cordifolia L. The new one was named as rubilactone and its structure was elucidated as 3'-carbomethoxy-4'-hydroxy-naphtho[1',2'-2,3] pyran-6-one (I) based on the physicochemical properties and spectrometric analysis (UV, IR, MS, 1HNMR and 13CNMR). The other three were 3'-carbomethoxy-4'-hydroxy-naphtho [1',2'-2,3] furan (II), dihydromollugin (III) and 3-carbomethoxy-2-(3'-hydroxy) isopentyl-1,4-naphthohydroquinone-1-O-.beta.-D-glucoside (IV).