Dem IPB wird erneut ein beispielhaftes Handeln im Sinne einer chancengleichheitsorientierten Personal- und Organisationspolitik bescheinigt. Das Institut erhält zum 6. Mal in Folge das TOTAL E-QUALITY…
Die Plant Science Student Conference (PSSC) wird seit 20 Jahren im jährlichen Wechsel von Studierenden der beiden Leibniz-Institute IPK und IPB organisiert. Im Interview erläutern Christina Wäsch…
Bethke, J.; Karaghiosoff, K.; Wessjohann, L. A.;Synthesis of N,N-disubstituted selenoamides by O/Se-exchange with selenium–Lawesson's reagentTetrahedron Lett.446911-6913(2003)DOI: 10.1016/S0040-4039(03)01690-3
The selenium analogue of Lawesson's reagent, [PhP(Se)(μ-Se)]2 is an effective reagent for synthesizing N,N-disubstituted selenoamides. The reaction is carried out under mild conditions (room temperature) and affords the selenoamide in higher yield than using other selenation reagents.The selenium analogue of Lawesson's reagent, [PhP(Se)(μ-Se)]2 is an effective reagent for synthesizing N,N-disubstituted selenoamides.
Publikation
Anh, N. T. H.; Sung, T. V.; Wessjohann, L.;Some homoisoflavonoidal compounds from Ophiopogon Japonicus Ker-gawlerVietnam J. Chem.41117-121(2003)
2,4-Dimethoxy-2-methyl-6H-pyran-3-one (1), a hitherto unknown natural product, and the calcium salt of rehmapicroside (2) have been isolated from rhizomes of the Vietnamese variety of Rehmannia glutinosa Libosch together with a series of known compounds: norcarotenoids (3–5), 2-formyl-5-hydroxymethylfurane (6), the iridoid rehmaglutin D (7), iridoid glycosides (8–12) and phenylethyl alcohol glycosides (13–17). Their structures were determined by mass and NMR spectroscopy.
Publikation
Anh, N. T. H.; Sung, T. V.; Porzel, A.; Franke, K.; Wessjohann, L. A.;Homoisoflavonoids from Ophiopogon japonicus Ker-GawlerPhytochemistry621153-1158(2003)DOI: 10.1016/S0031-9422(02)00515-0
From the ethyl acetate extract of the tuberous roots of Ophiopogon japonicus (Liliaceae) eight known and five new homoisoflavonoidal compounds were isolated. The new compounds are 5,7-dihydroxy-8-methoxy-6-methyl-3-(2′-hydroxy-4′-methoxybenzyl)chroman-4-one (1), 7-hydroxy-5,8-dimethoxy-6-methyl-3-(2′-hydroxy-4′-methoxybenzyl)chroman-4-one (2), 5,7-dihydroxy-6,8-dimethyl-3-(4′-hydroxy-3′-methoxybenzyl)chroman-4-one (3), 2,5,7-trihydroxy-6,8-dimethyl-3-(3′,4′-methylenedioxybenzyl)chroman-4-one (4) and 2,5,7-trihydroxy-6,8-dimethyl-3-(4′-methoxybenzyl)chroman-4-one (5). Their structures have been elucidated by mass and NMR spectroscopy. Compounds 4 and 5 are the first isolated homoisoflavonoids with a hemiacetal function at position 2.Five new and eight known homoisoflavonoids were isolated from the tuberous roots of the medicinal plant Ophiopogon japonicus (Liliaceae) and identified by spectroscopic data.