Zobrazeno 1 - 10 of 128 pro vyhledávání: '"Marcel Sickert"'
1
Unravelling the configuration of transient ortho-quinone methides by combining microfluidics with gas phase vibrational spectroscopy
Autor: Knut R. Asmis, Christoph Schneider, Max Grellmann, Matthias Spanka, Marcel Sickert, Detlev Belder, Maik Pahl, Martin Mayer
Publikováno v: Physical Chemistry Chemical Physics. 22:4610-4616
The alkylidene double bond configuration of transient ortho-quinone methides (o-QMs) is studied by cryogenic ion trap vibrational spectroscopy. To this end, o-QMs are formed from ortho-hydroxy benzhydryl alcohols in a Brønsted acid mediated dehydrat
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::855245a3e1edeeb10fad22cf9fbd3c4f
https://doi.org/10.1039/c9cp06435d
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3
The Brønsted Acid-Catalyzed, Enantioselective Aza-Diels-Alder Reaction for the Direct Synthesis of Chiral Piperidones
Autor: Sergei Naumov, Christoph Schneider, Marcel Sickert, Claudia Weilbeer
Publikováno v: Chemistry (Weinheim an der Bergstrasse, Germany). 23(3)
We disclose herein the first enantioselective aza-Diels–Alder reaction of β-alkyl-substituted vinylketene silyl-O,O-acetals and imines furnishing a broad range of optically highly enriched 4-alkyl-substituted 2-piperidones. As a catalyst for this
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::34338adbac784f0f91c4f211a25ef300
https://pubmed.ncbi.nlm.nih.gov/27748978
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4
A Combined Vinylogous Mannich/Diels-Alder Approach for the Stereoselective Synthesis of Highly Functionalized Hexahydroindoles
Autor: Bettina M. Ruff, Sabilla Zhong, Martin Nieger, Stefan Bräse, Marcel Sickert, Christoph Schneider
Publikováno v: European Journal of Organic Chemistry. 2011:6558-6566
A versatile strategy for the formation of hydroindole derivatives is reported. The molecules synthesized are highly functionalized and bear up to six stereogenic centers. We were able to develop a stereoselective route starting from nonchiral commerc
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::614dfe9136e3d27289542bdc4861177e
https://doi.org/10.1002/ejoc.201100996
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7
A Straightforward Synthesis of (S)-Anabasine via the Catalytic, Enantio­selective Vinylogous Mukaiyama-Mannich Reaction
Autor: Christoph Schneider, David S. Giera, Marcel Sickert
Publikováno v: Synthesis. 2009:3797-3802
The tobacco alkaloid (S)-anabasine was synthesized by a straightforward 4-step sequence with the catalytic enantioselective vinylogous Mannich reaction as a key step. Only 3 mol% of a structurally optimized chiral BINOL-based phosphoric acid was empl
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::68be5d6f8e17b1be0e82babd112fac8e
https://doi.org/10.1055/s-0029-1217026
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8
Brønsted Acid-Catalyzed, Enantioselective, Vinylogous Mannich Reaction of Vinylketene Silyl N,O-Acetals
Autor: Christoph Schneider, David S. Giera, Marcel Sickert
Publikováno v: Organic Letters. 10:4259-4262
Vinylketene silyl N, O-acetals undergo chiral phosphoric acid-catalyzed, vinylogous Mukaiyama-Mannich reactions with imines and afford delta-amino-alpha,beta-unsaturated amides in typically good yields, complete gamma-regioselectivity, and up to 92%
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c56778a2d2f7835e8000741a679952f8
https://doi.org/10.1021/ol8017374
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