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87 Aktuelle Fachpublikationen von Beilstein-Institut
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Identification and isolation of insecticidal oxazoles from Pseudomonas spp.
18.05.2012 | Florian Grundmann, Veronika Dill, Andrea Dowling, Aunchalee Thanwisai, Edna Bode, Narisara Chantratita, Richard ffre ..., Beilstein Journal of Organic Chemistry, 2012
Abstract Two new and five known oxazoles were identified from two different Pseudomonas strains in addition to the known pyrones pseudopyronine A and B. Labeling experiments confirmed their structures and gave initial evidence for a novel biosynthesis pathway of these natural oxazoles. In ...
Regioselective chlorination and bromination of unprotected anilines under mild conditions using copper halides in ionic liquids
16.05.2012 | Han Wang, Kun Wen, Nurbiya Nurahmat, Yan Shao, He Zhang, Chao Wei, Ya Li, Yongjia Shen and Zhihua Sun, Beilstein Journal of Organic Chemistry, 2012
Abstract By using ionic liquids as solvents, the chlorination or bromination of unprotected anilines at the para-position can be achieved in high yields with copper halides under mild conditions, without the need for potentially hazardous operations such as supplementing oxygen or gaseous ...
Synthesis of functionalized macrocyclic derivatives of trioxabicyclo[3.3.0]nonadiene
15.05.2012 | Sabine Leber, Gert Kollenz and Curt Wentrup, Beilstein Journal of Organic Chemistry, 2012
Abstract C72-Macrocyclic systems functionalized with nitroaryl and arylamino groups were synthesized from the bisdioxine diacid dichloride 1,3,5,7-tetra-tert-butyl-2,6,9-trioxabicyclo[3.3.1]nona-3,7-diene-4,8-dicarbonyl dichloride (3). Beilstein J. Org. Chem. 2012, 8, ...
Synthesis and antifungal properties of papulacandin derivatives
14.05.2012 | Marjolein van der Kaaden, Eefjan Breukink and Roland J. Pieters, Beilstein Journal of Organic Chemistry, 2012
Abstract Derivatives of an antifungal agent that targets the β-(1,3)-D-glucan synthase, papulacandin D, were synthesized and tested for activity. The papulacandin D structure contains a challenging benzannulated spiroketal unit, which is introduced in a palladium-catalyzed cross-coupling ...
Synthesis of axially chiral oxazoline–carbene ligands with an N-naphthyl framework and a study of their coordination with AuCl·SMe2
11.05.2012 | Feijun Wang, Shengke Li, Mingliang Qu, Mei-Xin Zhao, Lian-Jun Liu and Min Shi, Beilstein Journal of Organic Chemistry, 2012
Abstract Axially chiral oxazoline–carbene ligands with an N-naphthyl framework were successfully prepared, and their coordination behavior with AuCl·SMe2 was also investigated, affording the corresponding Au(I) complexes in moderate to high yields. Beilstein J. Org. Chem. 2012, 8, ...
Chemo-enzymatic modification of poly-N-acetyllactosamine (LacNAc) oligomers and N,N-diacetyllactosamine (LacDiNAc) based on galactose oxidase treatment
09.05.2012 | Christiane E. Kupper, Ruben R. Rosencrantz, Birgit Henßen, Helena Pelantová, Stephan Thönes, Anna Drozdová, Vladimir ..., Beilstein Journal of Organic Chemistry, 2012
Abstract The importance of glycans in biological systems is highlighted by their various functions in physiological and pathological processes. Many glycan epitopes on glycoproteins and glycolipids are based on N-acetyllactosamine units (LacNAc; Galβ1,4GlcNAc) and often present on extended ...
Synthesis and antiviral activities of spacer-linked 1-thioglucuronide analogues of glycyrrhizin
08.05.2012 | Christian Stanetty, Andrea Wolkerstorfer, Hassan Amer, Andreas Hofinger, Ulrich Jordis, Dirk Claßen-Houben and Paul ..., Beilstein Journal of Organic Chemistry, 2012
Abstract The influenza virus infection remains a significant threat to public health and the increase of antiviral resistance to available drugs generates an urgent need for new antiviral compounds. Starting from the natural, antivirally active compound glycyrrhizin, spacer-bridged ...
Enantioselective Michael addition of 2-hydroxy-1,4-naphthoquinones to nitroalkenes catalyzed by binaphthyl-derived organocatalysts
07.05.2012 | Saet Byeol Woo and Dae Young Kim, Beilstein Journal of Organic Chemistry, 2012
Abstract The highly enantioselective Michael addition of 2-hydroxy-1,4-naphthoquinones to nitroalkenes, promoted by binaphthyl-modified chiral bifunctional organocatalysts is described. This reaction afforded the chiral functionalized naphthoquinones in high yields (81–95%) and excellent ...
Synthesis of 2,6-disubstituted tetrahydroazulene derivatives
04.05.2012 | Zakir Hussain, Henning Hopf, Khurshid Ayub and S. Holger Eichhorn, Beilstein Journal of Organic Chemistry, 2012
Abstract Synthesis of hydroazulene derivatives has been carried out through a ring-enlargement route by using carbene adduct intermediates. The protocol can be applied for the construction of functionalized hydroazulene skeletons as key components of many natural products as well as the ...
Thiophene-based donor–acceptor co-oligomers by copper-catalyzed 1,3-dipolar cycloaddition
03.05.2012 | Stefanie Potratz, Amaresh Mishra and Peter Bäuerle, Beilstein Journal of Organic Chemistry, 2012
Abstract Herein we present a three-component one-pot procedure to synthesize co-oligomers of a donor–acceptor–donor type, in which thiophene moieties work as donor and 1,2,3-triazoles as acceptor units. In this respect, terminally ethynylated (oligo)thiophenes were coupled to halogenated ...
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