Saponins, naphthohydroquinone and anthraquinone glycosides from Rubia cordifolia L.

From the butanol fraction of the chloroform-​methanol ext. (1:1) of the dried roots of Rubia cordifolia L, several compds. were isolated and identified viz, the saponins hederagenin-​3-​O-​α-​L-​arabinopyranoside and 3-​O-​α-​L-​arabinopyranosyl-​hederagenin-​28-​Oβ-​D-​glucopyranosyl-​(1→6)​-​β-​D-​glucopyranoside ester, the naphthohydroquinone glycosides: 2-​carbomethoxy-​3-​prenyl-​1,​4-​naphthohydroquinone 4-​O-​β-​glucoside and 2-​carbomethoxy-​3-​prenyl-​1,​4-​naphtho-​hydroquinone 1,​4-​di-​O-​β-​glucoside, the anthraquinone glycosides: 1-​hydroxy-​2-​hydroxymethyl-​9,​10-​anthraquinone-​11-​β-​D-​glucopyranosyl-​(1→6)​-​β-​D-​glucopyranoside, 2-​methyl-​1,​3,​6-​trihydroxy-​9,​10-​anthraquinone-​3-​O-​α-​rhamnopyranosyl (1→2)​-​(4'-​O-​acetyl)​-​β-​glucopyranoside and 2-​carbomethoxy, 1,​3-​dihydroxy-​9,​10-​anthraquinone-​3-​O-​α-​rhamno-​pyranosyl-​(1→2)​-​β-​glucopyranoside and adenosine.  The identification of the isolated compds. was done using different phys., chem. and spectral methods