Zobrazeno 1 - 10 of 15 pro vyhledávání: '"Markus E. Scheller"'
1
Synthesis of 5-substituted pyrrole-2-carboxaldehydes. Part I. Generation of formal 5-lithiopyrrole-2-carboxaldehyde equivalents by bromine–lithium exchange of 2-bromo-6-(diisopropylamino)-1-azafulvene derivatives
Autor: Joseph M. Muchowski, Petr Hess, Liu Yanzhou, Markus E. Scheller, Michael L. Maddox, Sylvie L. Berthiaume, Brian L. Bray
Publikováno v: Canadian Journal of Chemistry. 73:675-684
The first known lithiated 1-azafulvene derivatives, e.g., 8 and 13a, were generated by a low-temperature bromine–lithium exchange procedure with tert-butyllithium. These lithio species show substantial stability at ≤ −90 °C because, at these t
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::622a4f361ed249051f47ba4fefc0c788
https://doi.org/10.1139/v95-086
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3
Photochemical Reactions. 153th communication. Photochemistry of acylsilanes: Photolyses and thermolyses of ?,?-epoxy silyl ketones
Autor: Markus E. Scheller, Bruno Frei
Publikováno v: Helvetica Chimica Acta. 75:69-78
The photolyses and thermolyses of the α,β-epoxy silyl ketones 5 and 6 are described. On n,π*-excitation, the silyl ketones 5 and 6 were transformed to the ketone 7 and the ketene 8 in quantitative yield. The formation of 8 may be explained by init
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::052e8d67670fcfebe4d05bd4e7c82c43
https://doi.org/10.1002/hlca.19920750105
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4
Photochemical reactions. 152nd Communication. Photochemistry of acylsilanes; photolysis and thermolysis of cyclopropyl silyl ketones
Autor: Markus E. Scheller, Bruno Frei
Publikováno v: Helvetica Chimica Acta. 73:922-931
The photolysis and thermolysis of the Cyclopropyl silyl ketones 3, 4, and 5 are described. On n,π* excitation, the silyl ketones 3 and 4 undergo a Norrish-type-II reaction involving γ-H abstraction, cyclopropyl ring cleavage followed by retro-enoli
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::de31c3ae5febfafa85006aba2267b2af
https://doi.org/10.1002/hlca.19900730420
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5
Lithiated Azafulvenes by Halogen/Metal Interchange of Brominated 6-(Diisopropylamino)-1-azafulvene Derivatives. Novel synthesis of 5-mono- and 4,5-disubstituted 1H-pyrrole-2-carbaldehydes
Autor: Joseph M. Muchowski, Markus E. Scheller, Brian L. Bray, Petr Hess
Publikováno v: Helvetica Chimica Acta. 71:2053-2057
The first known lithiated 1-azafulvene derivatives were generated by low-temperature halogen/metal interchange, with t-BuLi, from the corresponding brominated 6-diisopropylamino compounds 3b and 12. These Li species reacted with sundry eletrophilic r
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fc5eb729adba8040b497ea1d326f1675
https://doi.org/10.1002/hlca.19880710823
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6
Syntheses of ?, ?-Epoxy Silyl Ketones
Autor: Markus E. Scheller, W. Bernd Schweizer, Bruno Dr. Frei
Publikováno v: Helvetica Chimica Acta. 72:264-270
The synthesis of the α, β-epoxy-acylsilanes 1 and 2 starting from the allylic silyl alcohols (E)- and (Z)-3, respectively, by epoxidation with t-BuOOH/VO(acac)2 followed by oxidation with Collins reagent (CrO3/pyridine) in up to 70% overall yields,
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::343ba3e9065ced86ac2546aadf19bbf2
https://doi.org/10.1002/hlca.19890720210
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8
Photochemical reactions. 148th communication. Photochemistry of acylsilanes: Preparation, photolyses, and thermolyses of ?,?-unsaturated silyl ketones
Autor: Bruno Frei, Genji Iwasaki, Markus E. Scheller
Publikováno v: Helvetica Chimica Acta. 69:1378-1394
The syntheses, photolyses, and thermolyses of the α,β-unsaturated silyl ketones (E/Z)-7, (E)-8, and (E)-9 are described. On n,π*-excitation (λ > 347 mm), the aforementioned compounds undergo (E/Z)-isomerization followed by γ-H abstraction. The i
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0fe5018649300175d65e20393bc681c1
https://doi.org/10.1002/hlca.19860690612
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9
Synthesis of N-Unsubstituted α-Alkylated Pyrrol-2-Acetonitriles
Autor: Joseph M. Muchowski, Markus E. Scheller
Publikováno v: Synthetic Communications. 17:863-875
Nucleophilic addition of alkyllithium compounds to in situ generated 6-dimethyl-amino-1-azafulvene produced the α-alkylated pyrrole Mannich bases (3). Reaction of the p-toluenesulfonic acid salt of such bases with excess sodium cyanide in wet aceton
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2386a93dab0d8fa28b0dc6d30d39baf8
https://doi.org/10.1080/00397918708063943
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10
Synthesis of 4-acylindoles via 2-(2-phenylsulfinylvinyl)pyrrole
Autor: Joseph M. Muchowski, Markus E. Scheller
Publikováno v: Tetrahedron Letters. 28:3453-3456
4-Acylindoles are readily obtained by the [4π + 2π] cycloaddition of 1-triisopropylsilyl-trans-2-(2-phenylsulfinylvinyl)-pyrrole with electron deficient acetylenes followed by N-desilylation of the cycloadducts with fluoride ion.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7a58a4df7f30b27d5fed4b6eceda6db8
https://doi.org/10.1016/s0040-4039(00)96324-x
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