Výsledky vyhledávání - "Mathias Lubbe"

Regioselective synthesis of salicylates and acetophenones by formal [3+3]-cyclocondensations of 3-oxoorthoesters with 1,3-bis(trimethylsilyloxy)-1,3-butadienes

Autor: Peter Langer, Jörg-Peter Gütlein, Holger Feist, Alexander Villinger, Mathias Lubbe

Publikováno v: Zeitschrift für Naturforschung B. 76:1-26

A variety of 4-methoxysalicylates and related polyketide-type phenols are regioselectively prepared by formal [3+3] cyclocondensations of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-oxo-orthoesters. Cycloalkyl-substituted salicylates were prepar

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::518c01aab27188fd613eb41610df5582
https://doi.org/10.1515/znb-2020-0114

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Regioselective synthesis of 3-(methylthio)phenols by formal [3+3]-cyclocondensations of 3-oxo-bis(methylthio)ketenacetals with 1,3-bis(trimethylsilyloxy)-1,3-butadienes and 1,3-dicarbonyl dianions

Autor: Tiana Trabhardt, Alexander Villinger, Franziska Bendrath, Mathias Lubbe, Christine Fischer, Peter Langer

Publikováno v: Tetrahedron. 69:5998-6007

The cyclization of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-oxo-bis(methylthio)ketenacetals afforded 3-(methylthio)phenols containing an acyl or ester substituent located at position 2. The cyclization of free 1,3-dicarbonyl dianions with 3-o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::01ff17f30bcb3d05b813ddd75bd0257a
https://doi.org/10.1016/j.tet.2013.03.069

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Regioselective synthesis of 5-ethoxycarbonyl-, 5-acetyl- and 5-trifluoroacetyl-6-trifluoromethylsalicylates by one-pot cyclizations of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-alkoxy-2-alken-1-ones

Autor: Nazken K. Kelzhanova, Peter Langer, Simone Ladzik, Mathias Lubbe, Holger Feist, Zharylkasyn A. Abilov

Publikováno v: Journal of Fluorine Chemistry. 136:38-42

5-Ethoxycarbonyl-, 5-trifluoroacetyl-, and 5-acetyl-6-trifluoromethylsalicylates were prepared by one-pot cyclizations of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-alkoxy-2-alken-1-ones. The reactions proceeded with very good regioselectivity

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c186e05ed8d2d724cf29ab799b6fb629
https://doi.org/10.1016/j.jfluchem.2012.02.002

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Competing Regiodirecting Effects of Ester and Aryl Groups in [3+3] Cyclocondensations of 1,3-Bis(trimethylsilyloxy)-1,3-butadienes: Regioselective Synthesis of 3-Hydroxyphthalates and 2-Hydroxyterephthalates

Autor: Olumide Fatunsin, Alexander Villinger, Peter Langer, Mathias Lubbe, Stefanie Reim, Abdolmajid Riahi, Mohanad Shkoor, Christine Fischer, Muhammad Sher

Publikováno v: European Journal of Organic Chemistry. 2010:3732-3742

3-Hydroxy-5-methylphthalates are prepared by regioselective chelation-controlled cyclization of 1,3-bis(silyloxy)-1,3-butadienes with 4-silyloxy-2-oxo-3-butenoates derived from acetylpyruvates. The employment of silylated benzoylpyruvates instead of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::285fa06956d187dd94ecd0b2198a9995
https://doi.org/10.1002/ejoc.200901373

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Synthesis of 3-hydroxy-5-alkoxyhomophthalates by domino ‘2 : 1-coupling/intramolecular aldol condensation’ reactions of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with tetraalkoxymethanes

Autor: Mathias Lubbe, Peter Langer

Publikováno v: Org. Biomol. Chem.. 8:881-885

The first domino '2 : 1 condensation/intramolecular aldol' reactions of 1,3-bis(trimethylsilyloxy)-1,3-butadiene with tetraalkoxymethanes provide a convenient approach to 3-hydroxy-5-alkoxyhomophthalates. These products, which contain one free and on

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::26510c5385dd5858ca9483c8a4c99bf5
https://doi.org/10.1039/b918466j

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Synthesis of Trifluoromethyl-Substituted Arenes, Cyclohexenones and Pyran-4-ones by Cyclocondensation of 1,3-Bis(silyloxy)-1,3-butadienes with 4,4-Dimethoxy-1,1,1-trifluorobut-3-en-2-one: Influence of the Lewis Acid on the Product Distribution

Autor: Peter Langer, Anke Spannenberg, Mathias Lubbe, Alina Bunescu, Sebastian Reimann

Publikováno v: The Journal of Organic Chemistry. 74:5002-5010

The TiCl(4)-mediated formal [3 + 3] cyclocondensation of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 4,4-dimethoxy-1,1,1-trifluorobut-3-en-2-one afforded a variety of functionalized 4-methoxy-6-(trifluoromethyl)salicylates and 3-methoxy-5-(trifluo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::01756d9c7d697a33677d6ab3b258300a
https://doi.org/10.1021/jo900702u

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First synthesis of functionalized 5-aryl-3-(trifluoromethyl)phenols by regioselective [3+3] cyclocondensations of 1,3-bis(silyloxy)-1,3-butadienes with 3-aryl-3-silyloxy-1-trifluoromethyl-2-en-1-ones

Autor: Peter Langer, Mirza A. Yawer, Christine Fischer, Mathias Lubbe, Ibrar Hussain, Helmut Reinke, Stefan Büttner, Abdolmajid Riahi, Alexander Villinger

Publikováno v: Tetrahedron. 65:2124-2135

A variety of functionalized 5-aryl-3-(trifluoromethyl)phenols were prepared by the first TiCl4-mediated [3+3] cyclocondensation of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-aryl-3-trimethylsilyloxy-1-trifluoromethyl-2-en-1-ones.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9543632ee99b21a35d62876071fc8893
https://doi.org/10.1016/j.tet.2008.12.076

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Regioselective synthesis of 4-alkyl- and 4-aryl-6-(perfluoroalkyl)salicylic acid derivatives by formal [3+3] cyclocondensation of 1,3-bis(silyloxy)-1,3-butadienes with 3-silyloxy-1-(perfluoroalkyl)prop-2-en-1-ones

Autor: Stefan Büttner, Christine Fischer, Mathias Lubbe, Helmut Reinke, Peter Langer

Publikováno v: Tetrahedron. 64:7968-7976

4-Alkyl- and 4-aryl-6-(perfluoroalkyl)salicylic acid derivatives were regioselectively prepared by [3+3] cyclization of 1,3-bis(silyl enol ethers) with 3-silyloxy-1-(perfluoroalkyl)prop-2-en-1-ones.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::41578a900d312d3128a0dc6affd61fc9
https://doi.org/10.1016/j.tet.2008.06.009

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Synthesis of 6-(perfluoroalkyl)salicylates by [3+3] cyclization of 1,3-bis(silyl enol ethers) with 3-ethoxy-1-(perfluoroalkyl)prop-2-en-1-ones

Autor: Christine Fischer, Mathias Lubbe, Constantin Mamat, Peter Langer

Publikováno v: Tetrahedron. 63:413-418

6-(Perfluoroalkyl)salicylates were prepared by [3+3] cyclization of 1,3-bis(silyl enol ethers) with 3-ethoxy-1-(perfluoroalkyl)prop-2-en-1-ones.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2df086240e4540f66ef21b91959af174
https://doi.org/10.1016/j.tet.2006.10.062

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Regioselective Synthesis of Polyketide-Type Phenols by Formal [3+3]-Cyclocondensations of 1,3-Bis(silyloxy)-1,3-butadienes with 3-Oxoorthoesters

Autor: Helmut Reinke, Peter Langer, Jörg-Peter Gütlein, Mathias Lubbe

Publikováno v: Synlett. 2008:2671-2673

A variety of 4-methoxysalicylates and related polyketide-type phenols are regioselectively prepared by the first formal [3+3]-cyclocondensations of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-oxoorthoesters.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::92fb3c5abdeffaea99a2fd848743457a
https://doi.org/10.1055/s-0028-1083524

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