Zobrazeno 1 - 10 of 13 pro vyhledávání: '"Verena Specowius"'
1
Benzo-Annulated Steroids: Synthesis of Octahydro-indeno-phenanthrenes by Formal [3+3] Cyclocondensation Reaction with 1,3-Bis[(trimethylsilyl)oxy]buta-1,3-dienes
Autor: Verena Specowius, Gyula Schneider, János Wölfling, Peter Langer, Friedrich Erben
Publikováno v: Helvetica Chimica Acta. 96:924-930
Octahydro-indeno-phenanthrenes, benzo-annulated steroids, were prepared by formal [3+3] cyclocondensation reaction of 1,3-bis[(trimethylsilyl)oxy]buta-1,3-dienes with the silyl enol ether of 16-formylestrone methyl ether.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ace58d5eb6bdfd1286d5b24f2203b698
https://doi.org/10.1002/hlca.201200242
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3
Synthesis of 2-chloro-3-oxoesters by reaction of the dianion of ethyl 2-chloroacetoacetate with electrophiles
Autor: Holger Feist, Peter Langer, Ashot S. Saghyan, Verena Specowius, Stefanie Reim, Thomas Rahn, Muhammad Adeel
Publikováno v: Monatshefte für Chemie - Chemical Monthly. 144:627-631
2-Chloro-3-oxoalkanoates and related molecules were prepared by regioselective reaction of the dianion of ethyl 2-chloroacetoacetate with alkyl halides and other electrophiles.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9cac2f665e3e8db20acee171e05e9284
https://doi.org/10.1007/s00706-012-0897-z
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4
3,5-Dioxopimelates as new synthetic building blocks. Cyclocondensation with 1,2-, 1,3- and 1,4-dinucleophiles
Autor: Dirk Michalik, Peter Langer, Verena Specowius, Franziska Bendrath
Publikováno v: Tetrahedron. 68:6456-6462
Cyclocondensation reactions of 3,5-dioxopimelates, new and versatile synthetic building blocks, with hydrazines, urea, thiourea and phenylene-1,2-diamines allow for a convenient synthesis of various heterocycles containing two ester-substituted side-
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4ec4a0e40b867a68afd1ee7e1e1cfc95
https://doi.org/10.1016/j.tet.2012.05.119
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5
Regioselective synthesis of CF2Cl-substituted biaryls by [3+3] cyclocondensation of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 4-aryl-1-chloro-1,1-difluoro-4-(trimethylsilyloxy)-3-en-2-ones
Autor: Verena Specowius, Nazken K. Kelzhanova, Zharylkasyn A. Abilov, Peter Langer
Publikováno v: Monatshefte für Chemie - Chemical Monthly. 143:1151-1156
The TiCl4-mediated [3+3] cyclocondensation of various 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 4-aryl-1-chloro-1,1-difluoro-4-(trimethylsilyloxy)-3-en-2-ones provides a regioselective approach to novel 4-aryl-6-(chlorodifluoromethyl)salicylates
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::751eeb280b01f6101854a69accc7f88e
https://doi.org/10.1007/s00706-012-0795-4
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6
Synthesis of Functionalized Indolizines by Lewis Acid-Mediated Cyclocondensation of 3-(Pyridin-2-yl)-propiolates with Enones
Autor: Franziska Bendrath, Peter Langer, Marleen Winterberg, Khurshid Ayub, Verena Specowius
Publikováno v: Advanced Synthesis & Catalysis. 354:1163-1169
Functionalized indolizines were prepared by Lewis acid-catalyzed cyclizations of 3-(pyridin-2-yl)-propiolates with enones. This new type of reaction provides a convenient and regioselective approach to ester-substituted indolizine derivatives which a
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::13e037c2dfab241225fd55a774132227
https://doi.org/10.1002/adsc.201100795
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7
A general strategy for the synthesis of difluoromethyl-containing pyrazoles, pyridines and pyrimidines
Autor: Satenik Mkrtchyan, Viktor O. Iaroshenko, Peter Langer, Alexander Villinger, Katharina Vlach, Marcelo Vilches-Herrera, Dmytro Ostrovskyi, Verena Specowius
Publikováno v: Tetrahedron. 67:5663-5677
Difluoromethyl-containing heteroannulated pyridines, pyrimidines and pyrazoles are prepared by a two step method. The regioselective cyclizations of electron-excessive aminoheterocycles, hydrazines and amidines with CF 2 Cl-substituted 1,3-dicarbonyl
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e59e6079b91f3df23a6b9ec7d780b159
https://doi.org/10.1016/j.tet.2011.05.085
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9
ChemInform Abstract: Synthesis of 2-Chloro-3-oxoesters by Reaction of the Dianion of Ethyl 2-Chloroacetoacetate with Electrophiles
Autor: Muhammad Adeel, Holger Feist, Peter Langer, Thomas Rahn, Ashot S. Saghyan, Stefanie Reim, Verena Specowius
Publikováno v: ChemInform. 44
Title compounds [(III), (V), and (VII)] as well as 2-alkylidenetetrahydrofuran (IX) are synthesized by regioselective reaction of the dianion of ester (I) with halides [(II), (IV), or (VIII)] or aldehydes (VI), respectively.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::aaccbea1b0bb7fb9d64a072d95755934
https://doi.org/10.1002/chin.201331077
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10
ChemInform Abstract: 3,5-Dioxopimelates as New Synthetic Building Blocks. Cyclocondensation with 1,2-, 1,3- and 1,4-Dinucleophiles
Autor: Peter Langer, Verena Specowius, Franziska Bendrath, Dirk Michalik
Publikováno v: ChemInform. 43
The regioselective cyclocondensation of 3,5-dioxopimelates with 1,2-, 1,3-, and 1,4-dinucleophiles affords a variety of functionalized heterocycles, which are not readily available by other methods.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9785f08f83397b71a20a81c85e0347b4
https://doi.org/10.1002/chin.201252028
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