Zobrazeno 1 - 10
of 301
pro vyhledávání: '"Johann, Lex"'
Autor:
Tamer T. El-Idreesy, Dirk Blunk, Jörg Neudörfl, Johann Lex, Lars-Oliver Höinck, Axel G. Griesbeck
Publikováno v:
Molecules, Vol 13, Iss 8, Pp 1743-1758 (2008)
A set of new bis-spirofused 1,2,4-trioxanes 4a-d was obtained from the reaction of cyclohexane-1,4-dione with allylic hydroperoxides 2a-d, bearing an additional hydroxy group in the homoallylic position, by diastereoselective photooxygenation of ally
Externí odkaz:
https://doaj.org/article/d511986ccb0d4f1fa15b2cd2ea281d9d
Autor:
Virginia Lüdke, Laetitia Bonnet, Michael Oelgemöller, Johann Lex, Luke Ashton, Jonathan Pettinger, Katrin Krüger, Cherie A. Motti
Publikováno v:
Tetrahedron Letters. 59:1427-1430
The photochemistry of several phthalimido acetamides and phthaloyl dipeptide esters has been investigated. Their photocyclization ability strongly depended on the substitution pattern of the amide linker group. While secondary amide-derived starting
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3c1ac162a6fee8d0805fb351313b13c6
https://doi.org/10.1016/j.tetlet.2018.02.074
https://doi.org/10.1016/j.tetlet.2018.02.074
Autor:
Jana Engler, Johannes Wißen, Johann Lex, Fadi Hatoum, Cherie A. Motti, Christina Zelmer, Michael Oelgemöller
Publikováno v:
Tetrahedron Letters. 53:5573-5577
A series of 3-(alkyl and aryl)methyleneisoindolin-1-one derivatives were synthesized in a simple two-step procedure using a recently established photodecarboxylative addition of carboxylates to phthalimides as the key-step. Subsequent acid-catalyzed
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5c8aa62a9c28affb719331cecc0336c3
https://doi.org/10.1016/j.tetlet.2012.07.142
https://doi.org/10.1016/j.tetlet.2012.07.142
Publikováno v:
Tetrahedron. 68:4048-4056
Six cyclic stilbene derivatives with hindered free rotation around the C(vinyl)–C(phenyl) single bond were synthesized by McMurry coupling. The torsion angles around the double and the single bond, and the CC bond length were obtained for many of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f3b6e103556afa200fab2baab955597d
https://doi.org/10.1016/j.tet.2012.03.038
https://doi.org/10.1016/j.tet.2012.03.038
Publikováno v:
Tetrahedron Letters. 50:6335-6338
Photoadditions of phenylacetates to phthalimides give the corresponding benzylated hydroxyphthalimidines in moderate to high yields of 29–90%. With 2-phenylpropanoate, photoaddition affords a diastereoisomeric mixture in a de of 24% in favour of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b4adb1ed40e7bcc54ad792e61c8dddd0
https://doi.org/10.1016/j.tetlet.2009.08.115
https://doi.org/10.1016/j.tetlet.2009.08.115
Autor:
Torsten Ahner, Michael Oelgemöller, Johann Lex, Ferdinand Friedrichs, Jochen Mattay, Michael Ryan, Mario Funke, Delphine Nayrat, Brian R. Murphy
Publikováno v:
Synlett. 2008:3137-3140
Irradiation of 1,4-naphthoquinone at 300 25 rim in benzene and in the presence of aliphatic aldehydes readily yields acylated hydroquinones in good to high yields. The developed protocol represents a significant improvement over the original procedur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::31c4e06e86ad4ce6dedf7c9ae00c5100
https://doi.org/10.1055/s-0028-1087272
https://doi.org/10.1055/s-0028-1087272
Autor:
Masatoshi Mitani, Jörg-Martin Neudörfl, Hans-Günther Schmalz, Andreas Adler, Anne Becker, Janna Velder, Johann Lex, Sherif El Sheikh, Sachio Goto, Said Elmas, Yuki Sakamoto
Publikováno v:
Synlett. 2008:1361-1365
Exploiting the high rate of bromine-lithium exchange reactions, aryl carbinols such as fenpy-type ligands are readily obtained by simply combining a mixture of a ketone and an aryl bromide with butyllithium.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aa3188844ef47b08873c3b90cd9c5ac7
https://doi.org/10.1055/s-2008-1072771
https://doi.org/10.1055/s-2008-1072771
Autor:
Albrecht Berkessel, Eva Leitterstorf, Johann Lex, Mathias Schäfer, Julia Frey, Marc Brandenburg
Publikováno v:
Advanced Synthesis & Catalysis. 349:2385-2391
A modular synthesis for chiral and non-symmetrical salalen ligands (i.e., mono-reduced salens), carrying an imine and an amine functionality has been developed. The ligands can be assembled in situ by Schiff base formation of an N-(2-hydroxybenzyl)di
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e7123971d30d1501a40cc6604c7ce6a1
https://doi.org/10.1002/adsc.200700221
https://doi.org/10.1002/adsc.200700221
Autor:
Stefan Neufeind, David Sucunza, Hans-Günther Schmalz, Daniel Dembkowski, Janna Velder, Johann Lex
Publikováno v:
Synlett. 2007:2569-2573
Studies on the total synthesis of mumbaistatin, the -strongest natural inhibitor of G6P-T1, have culminated in the synthesis of a 4′′,8-dideoxy analogue. Key steps include a Diels-Alder reaction for the construction of the functionalized anthraqu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0d58f31b63793b60e1c18ee70f3113d3
https://doi.org/10.1055/s-2007-986652
https://doi.org/10.1055/s-2007-986652
Publikováno v:
European Journal of Organic Chemistry. 2007:3991-3998
The configurational stability of reactive intermediates (cation, radical and anion) derived from ethylcyclobutadiene–Fe(CO)3 by formal abstraction of a hydride, a hydrogen atom or a proton from the pseudobenzylic position was investigated. Density
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4682ace8033964ab27467f5f26e580f7
https://doi.org/10.1002/ejoc.200700342
https://doi.org/10.1002/ejoc.200700342