Zobrazeno 1 - 10
of 78
pro vyhledávání: '"O. Schupp"'
Autor:
Mark Horswill, Ramani Ramchandran, Kallal Pramanik, Rajendra K. Kothinti, Noah R. Leigh, Mathias Francois, Monica Beltrame, George A. Wilkinson, Niloofar M. Tabatabai, Marcus O. Schupp, Ganesh V. Samant, Chang Zoon Chun, Peter Koopman, Suzanna Sellars, Indranil Sinha, Indulekha Remadevi, Silvia Moleri, Keguo Li
Publikováno v:
Journal of Biological Chemistry. 286:30740-30747
Despite their importance as members of the Roundabout (Robo) family in the control of axonal and vascular patterning, the transcriptional regulation of these genes is poorly understood. In this study, we show that members of the Sry-related high mobi
Autor:
Markus Heubes, and Bernd Schöner, Michael Ochse, O. Schupp, Matthias Breuning, Lothar Göbel, Gerhard Bringmann
Publikováno v:
The Journal of Organic Chemistry. 65:722-728
Configurationally unstable biaryl lactones of type (M)-1 ⇌ (P)-1 and ring-opened 2-acyl-2‘-hydroxy biaryl compounds of type (M)-4 ⇌ (P)-4 are versatile precursors for the atroposelective preparation of axially chiral biaryls. The activation bar
Autor:
Gerhard Bringmann, Wolfdieter A. Schenk, Jörg Kümmel, O. Schupp, Irene Reuther, A. Wuzik, Nicolai Burzlaff
Publikováno v:
European Journal of Inorganic Chemistry. 1999:1745-1756
The substitution-labile thiophene complex [CpRu{(S,S)-CHIRAPHOS}(SC4H4)]BF4 (2) [(S,S)-CHIRAPHOS = (2S,3S)bis(diphenylphosphanyl)butane], prepared from [CpRu{(S,S)-CHIRAPHOS}Cl] (1), thiophene, and AgBF4, reacted with the biaryl-thionolactones 3a–f
Autor:
D. Koppler, Gerhard Bringmann, Miriam Münchbach, Kim Messer, Matthias Wenzel, Adriaan M. Louis, Manuela Michel, O. Schupp
Publikováno v:
Phytochemistry. 51:693-699
From the rare West African liana, Dioncophyllum thollonii (Dioncophyllaceae), the known acetogenic tetralones, cis - and trans -isoshinanolone, were isolated. Exemplarily on this material, a new ruthenium-catalyzed oxidative degradation procedure, re
Publikováno v:
Journal of Chromatography A. 837:267-272
Exemplarily for a root extract of the West African liana Dioncophyllum thollonii a strategy for the rapid identification of secondary metabolites in plant extracts is presented, based upon on-line coupling of high-performance liquid chromatography wi
Publikováno v:
Tetrahedron. 53:9715-9726
The synthesis of a variety of differently substituted 1,2,3,4-tetrahydroquinolines by a new three-component reaction involving an imine (Ar-NCHR), an α-branched and enolizable aldehyde (R 1 R 2 CHCHO), and a nucleophile (ROH, ArSH, ArNH 2 , H 2 O
Publikováno v:
Zeitschrift für Naturforschung B. 52:355-358
The title compound 2c, a potentially useful synthetic intermediate in stereoselective biaryl synthesis, has been prepared from the oxolactone 1c, by treatment with Lawesson′s reagent. An X-ray structure analysis reveals its strongly helically disto
Publikováno v:
Tetrahedron. 51:9361-9366
The elucidation of the absolute configuration of a lactone-bridged biaryl was performed by multiple scattering X-ray experiments. This helical, but configuratively unstable compound shows spontaneous deracemization by crystallization. For the rapid s
Autor:
Gerhard Bringmann, Irene Reuther, Wolfdieter A. Schenk, O. Schupp, Bernd Schöner, R. Pikl, Wolfgang Kiefer
Publikováno v:
Journal of Organometallic Chemistry. 494:89-93
The preparation of the thiobutyrolactone complexes [Cp(dppx)Ru-1]PF 6 with dppx = dppm ( 1a ) and dppe ( 1b ) is described. Raman spectra of the polycrystalline solids and the CH 2 C1 2 solutions were recorded by means of the scanning multichannel te
Autor:
Markus Lankers, O. Schupp, Jürgen Popp, U. Posset, Gerhard Bringmann, Wolfgang Kiefer, Andrea Weippert, Ulrich Dauer
Publikováno v:
Inorganica Chimica Acta. 222:247-253
Semiempirical and ab initio calculations on the binding properties of the AlCl3 complex of 1,3-dimethylbenzo [b][naphtho[1,2-d]pyran-6-one are reported. Compounds of this type are key intermediates in the stereoselective synthesis of axially chiral b