Browsing by Author "Roderich Suessmuth"

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A new kaempferol diglycoside from Datura suaveolens Humb. & Bonpl. ex. Willd.
(2006) A. Sajeli Begum; Mahendra Sahai; Yoshinori Fujimoto; K. Asai; Kathrin Schneider; Graeme Nicholson; Roderich Suessmuth
A new flavonol glycoside, kaempferol 3-O-α-L-arabinopyranosyl-7- O-β-D-glucopyranoside (1), has been isolated from methanol extract of leaves of Datura suaveolens (Solanaceae), along with six other known compounds, which include kaempferol 3-O-α-L-arabinopyranoside (2), 3-phenyl lactic acid, 3-(3-indolyl) lactic acid, and its methyl ester, physalindicanol A and physalindicanol B. The structural elucidation of 1 and characterization of the known compounds are based on detailed spectral analysis (ESI-FTICR-MS and 2D-NMR). This is the first report of isolation of these compounds from this plant.
Hyosgerin, a new optically active coumarinolignan, from the seeds of Hyoscyamus niger
(2006) Begum Sajeli; Mahendra Sahai; Roderich Suessmuth; Teigo Asai; Noriyuki Hara; Yoshinori Fujimoto
Hyosgerin, a new optically active coumarinolignan, has been isolated and characterized along with three other coumarinolignans, venkatasin, cleomiscosin A and cleomiscosin B, from the seeds of Hyoscyamus niger L. The structure was determined on the basis of spectroscopic analysis and chemical conversion. The optical properties and absolute stereochemistry of these coumarinolignans have also been studied and discussed. © 2006 Pharmaceutical Society of Japan.