Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Heiko Leutbecher"'
Publikováno v:
Tetrahedron Letters. 52:605-608
The laccase-catalyzed domino reaction of o -phenylenediamine and benzaldehydes with aerial oxygen as the oxidant exclusively yields 2-aryl-1 H -benzimidazoles in good to very good yields. It is easy to perform under very mild reaction conditions.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::53e3a81d9913f4ee8520c54ce6b9a094
https://doi.org/10.1016/j.tetlet.2010.11.145
https://doi.org/10.1016/j.tetlet.2010.11.145
Publikováno v:
The Journal of Organic Chemistry. 74:7230-7237
The laccase-catalyzed reaction between catechols and heterocyclic 1,3-dicarbonyls (pyridinones, quinolinones, thiocoumarins) using aerial oxygen as the oxidant delivers benzofuropyridinones, benzofuroquinolinones, and thiocoumestans in a simple fashi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8b7465344c022ef0968ef872c159b917
https://doi.org/10.1021/jo9011915
https://doi.org/10.1021/jo9011915
Publikováno v:
Zeitschrift für Naturforschung B. 64:1-10
A range of new 7-phenyl-2H,5H-pyrano[4,3-b]pyran-5-ones and related tricyclic heterocycles was prepared in a single step by means of a domino Knoevenagel condensation/6π-electron electrocyclization under different reaction conditions, including ther
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b75412487be5cce6ef4244987b27322f
https://doi.org/10.1515/znb-2009-0801
https://doi.org/10.1515/znb-2009-0801
Publikováno v:
Zeitschrift für Naturforschung B. 63:871-876
Since the discovery of Troger’s base numerous structural analogs with a central [1,5]diazocine skeleton were synthesized [3, 4]. Both the chirality and the rigid concave structure of the methano[1,5]diazocine skeleton are the reasons why Troger’s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b5456e741556e9280e908352a75bd17d
https://doi.org/10.1515/znb-2008-0711
https://doi.org/10.1515/znb-2008-0711
Publikováno v:
Synlett. 2007:2545-2548
The process of the cationic olefin cyclization of 3-sub-stituted 4-hydroxy-2 H-pyran-2-ones 3 that may produce both TRANS- and CIS-pyrano[4,3- B]chromen-1-ones ( 4) and TRANS- and CIS-pyrano[2,3- B]chromen-4-ones ( 5) can be efficiently controlled by
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cb9315aedaf79f74b50f9bf089b2a7f9
https://doi.org/10.1055/s-2007-986660
https://doi.org/10.1055/s-2007-986660
Publikováno v:
Tetrahedron Letters. 48:5073-5076
Laccase initiated domino reactions of cyclohexane-1,3-diones with catechols using air as an oxidant afford 3,4-dihydro-7,8-dihydroxy-2 H -dibenzofuran-1-ones with yields ranging from 70% to 97%.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::12e6407e33d6e1ff9d3b0e26eb39b994
https://doi.org/10.1016/j.tetlet.2007.05.089
https://doi.org/10.1016/j.tetlet.2007.05.089
Autor:
Gerhard Greiner, Uwe Beifuss, Dietmar Schmidt, Heiko Leutbecher, Sabine Mika, Jürgen Conrad, Iris Klaiber
Publikováno v:
Synlett. 2007:1725-1729
Lewis acids like BF 3 ·OEt 2 , TiCl 4 , ZnCl 2 ·OEt 2 , ZnI 2 , and InCl 3 in liquid SO 2 as a solvent at low temperatures have been found to be highly efficient in epoxyolefin cyclizations with pyrones as terminators.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0b985718fca556a2ccbb176a99606732
https://doi.org/10.1055/s-2007-984506
https://doi.org/10.1055/s-2007-984506
Publikováno v:
Synlett. :3126-3130
Laccase-catalyzed domino reactions of 4-hydroxy-6-methyl-2H-pyran-2-one or substituted 4-hydroxy-2H-chromen-2-ones with calechols using molecular oxygen as an oxidant afford coumestans and related O-heterocycles with yields ranging from 51% to 99%.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e7590f7d73f85dabf4adbe85cece6c9b
https://doi.org/10.1055/s-2005-922748
https://doi.org/10.1055/s-2005-922748
Publikováno v:
QSAR & Combinatorial Science. 23:895-898
Both natural and unnatural compounds with a 2H,5H-pyrano[4,3-b]pyran-5-one skeleton are of interest to medicinal chemistry as they exhibit several different biological activities. This heterocyclic ring systems is accessible by a Domino Knoevenagel c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e37a733111589c5dbf18086d0c094172
https://doi.org/10.1002/qsar.200420048
https://doi.org/10.1002/qsar.200420048
Autor:
Robert Schnepf, Heiko Leutbecher, Achim Sokolowski, Eberhard Bothe, Peter Hildebrandt, Karl Wieghardt, Thomas Weyhermüller, Eckhard Bill
Publikováno v:
JBIC Journal of Biological Inorganic Chemistry. 2:444-453
The reaction of the macrocycles 1,4,7-tris (3,5-di-tert-butyl-2-hydroxy-benzyl)-1,4,7-triazacyclononane, L1H3, or 1,4,7-tris(3-tert-butyl-5-methoxy-2-hydroxy-benzyl)-1,4,7-triazacyclononane, L2H3, with Cu(ClO4)2·6H2O in methanol (in the presence of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0f5a775c672ccf9898e470cf569f3211
https://doi.org/10.1007/s007750050155
https://doi.org/10.1007/s007750050155