Výsledky vyhledávání - "Holger Feist"

Akademický článek

Pyrimidine Acyclo-C-Nucleosides by Ring Transformations of 2-Formyl-L-arabinal

Autor: Klaus Peseke, Manfred Michalik, Holger Feist, Ahmed Bari

Publikováno v: Molecules, Vol 10, Iss 8, Pp 837-842 (2005)

The protected 2-formyl-L-arabinal 2 reacted with thiourea and cyanamide in the presence of sodium hydride to afford via ring transformations the 5-[1R,2S-1,2- bis(benzyloxy)-3-hydroxypropyl]-1,2-dihydropyrimidines 3 and 4, respectively. Similarly, tr

Externí odkaz: https://doaj.org/article/545a646519494bc2a82122e92bacc88c

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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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Synthesis of 2,3,3a,9a-Tetrahydro-1H-cyclopenta[b]quinoxaline-1,3,4,9-tetracarboxylate by Cyclization of 1,5-Bis[(trimethylsilyl)oxy]penta-1,4-dienes with Quinoxalines

Autor: Holger Feist, Peter Langer, Nazken K. Kelzhanova, Jörg-Peter Gütlein, Sven Rotzoll, Dirk Michalik, Zharylkasyn A. Abilov, Alexander Villinger

Publikováno v: Helvetica Chimica Acta. 98:308-317

The cyclization of 1,5-bis[(trimethylsilyl)oxy]penta-1,4-dienes with quinoxalines and chloroformates afforded 2,3,3a,9a-tetrahydro-1H-cyclopenta[b]quinoxaline-1,3,4,9-tetracarboxylate.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::845ff7d38160f25d6544380ede7badbe
https://doi.org/10.1002/hlca.201400244

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Synthesis of functionalized fluorinated terphenyls by site-selective Suzuki–Miyaura cross-coupling reactions of dibrominated fluorobenzenes

Autor: Jamshed Iqbal, Tamás Patonay, Peter Langer, Aneela Maalik, Alexander Villinger, Holger Feist, Muhammad Sharif, Sebastian Reimann

Publikováno v: Journal of Fluorine Chemistry. 146:19-36

A variety of fluorinated terphenyls were prepared by site-selective Suzuki–Miyaura cross-coupling reactions of dibrominated fluorobenzenes, such as 1,2-dibromo-3,5-difluorobenzene, 1,4-dibromo-2-fluorobenzene, 1,3-dibromo-4-fluorobenzene, and 1,2-d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f9bfebfe688045e9e7a9a0cdcb17d906
https://doi.org/10.1016/j.jfluchem.2012.12.003

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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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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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Regioselective Arylation and Alkynylation of 2,3-Dibromo-1H-inden-1-one by SuzukiMiyaura and Sonogashira Cross-Coupling Reactions

Autor: Rasheed Ahmad Khera, Holger Feist, Nguyen Thai Hung, Peter Langer, Munawar Hussain, Nadi Eleya, Alexander Villinger

Publikováno v: Helvetica Chimica Acta. 95:469-482

SuzukiMiyaura reactions of 2,3-dibromo-1H-inden-1-one afforded a wide range of arylated 1H-inden-1-ones. Sonogashira cross-coupling reactions gave alkynylated indenones. The reactions proceeded with very good regioselectivity in the less sterically h

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a50ff327e61c007309b8acc98cd4a13f
https://doi.org/10.1002/hlca.201100315

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Suzuki–Miyaura reactions of the bis(triflates) of 1,3- and 1,4-dihydroxythioxanthone. Electronic and steric effects on the site-selectivity

Autor: Alexander Villinger, Peter Langer, Dhafer Saber Zinad, Holger Feist

Publikováno v: Tetrahedron. 68:711-721

The palladium(0)-catalyzed Suzuki cross-coupling reactions of the bis(triflates) of 1,3- and 1,4-dihydroxythioxanthone afforded various aryl-substituted thioxanthones. While the Suzuki reactions of the bis(triflate) derived from 1,3-dihydroxythioxant

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d7c145ac06a481289fd8d6c78310fd06
https://doi.org/10.1016/j.tet.2011.10.095

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