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Coumaroyl Adenosine and Lignan Glycoside from Amaranthus spinosus L

Azhar-ul-Haq, Malik A., Khan S., Muhammad P.

Polish Journal of Chemistry

2006

Vol. 80, nr 2

259-263

Phytochemical investigation of the n-butanol fraction of the methanolic extract of the whole plant of Amaranthus spinosus Linn. led to the isolation of amaranthoside, a lignan glycoside 1, and amaricin, a coumaroyl adenosine 2 along with stigmasterol glycoside 3. The structures of these compounds were determined by spectral analysis (including 1Dand 2D-NMR experiments) and comparison with literature data.

Urease Inhibiting Guaianolides from Amberboa ramosa

Khan S., Riaz N., Afza N., Malik A., Azhar-ul-Haq, Ahmed Z., Lodhi M., Choudhary M.

Polish Journal of Chemistry

2004

Vol.78 /nr 11-12

2075-2080

New sesquiterpene lactones have been isolated from the chloroform-soluble fraction of Amberboa ramosa and assigned two structures 4 beta-(chloromethyl)-3 beta, 4 alfa-dihydroxy, 8alfa-[(s)-2-carboxypropionoxy]-1alfaH,5alfaH,6betaH,7alfaH-guaia-10(14),11(13)-dien- 6,12-olide (1) and 4 beta(chloromethyl)-3beta ,4alfa-dihydroxy,8alfa-[(s)-3-hydroxy-2-methylpropionyloxy]- 1alfaH,5alfaH,6beta H,7alfaH-guaia-10(14),11(13)-dien-6,12-olide (2), respectively. In addition 5-hydroxy-6-methyl-7-methoxyflavone (3), 6,2',5'-trihydroxy-3,5,7-trimethoxyflavone (4) and 5-hydroxy-3,7,8,2'-tetramethoxyflavone (5) have also been reported for the first time from this species. Compounds 1 and 2 displayed promising inhibitory potential against enzyme urease in a concentration-dependent fashion.