0000000000485271

AUTHOR

Camran Flo

Reaktionen von elektronenreichen Heterocyclen mit Orthocarbonsäure-Derivaten, 10. Formylierungs- und Alkylierungsreaktionen von Carbazolen mit ambidenten Dialkoxycarbenium-tetrafluoroboraten

Carbazole werden durch Diethoxycarbenium-tetrafluoroborat mit hoher Regioselektivitat formyliert, wahrend die thermodynamisch stabileren Diethoxymethylcarbenium- und Trimethoxycarbenium-Ionen infolge ausgepragter ambidenter Elektrophilie Carbazole bevorzugt alkylieren. Reactions of Electron-Rich Heterocycles with Orthocarboxylic Acid Derivatives, 10. – Formylation and Alkylation of Carbazoles with Ambident Dialkoxycarbenium Tetrafluoroborates Carbazole and some derivatives were formylated regioselectively with diethoxycarbenium tetrafluoroborate. The thermodynamically more stable diethoxymethylcarbenium and trimethoxycarbenium ions exhibit ambident electrophilic reactivity as predominant al…

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Reaktionen von elektronenreichen Heterocyclen mit Orthocarbonsäure-Derivaten, 9. Acylierungsreaktionen von Indol und Methylindolen mit Dialkoxycarbenium-tetrafluoroboraten

Indol und einige Methylderivate 1 lassen sich unter milden Bedingungen mit den Dialkoxycarbenium-tetrafluoroboraten 2 in meist guten Ausbeuten regioselektive acylieren. Mit dem Formylkation-Aquivalent 2a′ werden mit uberschussigem 1 auch die Bisindolycarbenium-tetrafluoroborate 13a – d erhalten. Reactions of Electron-rich Heterocycles with Orthocarboxylic Acid Derivatives, 9. – Acylation of Indole and Methylindoles with Dialkoxycarbenium Tetrafluoroborates Indole and some methylindoles 1 were acylated regioselectively with dialkoxycarbenium tetrafluoroborates 2 under mild conditions. The formyl cation equivalent 2a′ reacts with excess of indoles 1 to give the bisindolylcarbenium tetrafluoro…

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ChemInform Abstract: First Electrophilic Substitutions of 3-Substituted Indoles with Diethoxycarbenium Tetrafluoroborate: Functionalized Indole Derivatives.

The indoles 2a-2c react with diethoxycarbenium tetrafluoroborate (1) to furnish the indolecarbaldehydes 3a-3d. In the thermodynamically controlled reaction of 3-methylindole (2a) with 1 the tris(indolyl)methane 4 and diskatole (5), are formed in addition. The limitations of these reactions are discussed and evidence is presented for a C-3-ipso-attack and a Wagner-Meerwein rearrangement, respectively, leading to the formation of 3b or 3d. Erste elektrophile Substitution von 3-substituierten Indolen mit Diethoxycarbenium-Tetrafluoroborat: Funktionalisierte Indol-Derivate Die Indole 2a-2c reagieren mit dem per se synthetisierten Diethoxycarbenium-Tetrafluoroborat (1) zu den Indolcarbaldehyden …

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Reaktion von elektronenreichen Heterocyclen mit Orthocarbonsäure-Derivaten, 12. Formylierung von Vinylindolen mit Diethoxycarbenium-tetrafluoroborat

Reactions of Electron-Rich Heterocycles with Orthocarboxylic Acid Derivatives, 12. – Formylation of Vinylindoles with Diethoxycarbenium Tetrafluoroborate 2- and 3-vinylindoles 1, 3 are formylated with diethoxycarbenium tetrafluoroborate regioselectively. The significant selectivity and reactivity of formylation of diethoxycarbenium ion in comparison with other thermodynamically more stable dialkoxycarbenium ions are compatible with the known results of hetaryl functionalisation with orthocarboxylic acid derivatives.

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First Electrophilic Substitutions of 3-Substituted Indoles with Diethoxycarbenium Tetrafluoroborate: Functionalized Indole Derivatives

The indoles 2a-2c react with diethoxycarbenium tetrafluoroborate (1) to furnish the indolecarbaldehydes 3a-3d. In the thermodynamically controlled reaction of 3-methylindole (2a) with 1 the tris(indolyl)methane 4 and diskatole (5), are formed in addition. The limitations of these reactions are discussed and evidence is presented for a C-3-ipso-attack and a Wagner-Meerwein rearrangement, respectively, leading to the formation of 3b or 3d. Erste elektrophile Substitution von 3-substituierten Indolen mit Diethoxycarbenium-Tetrafluoroborat: Funktionalisierte Indol-Derivate Die Indole 2a-2c reagieren mit dem per se synthetisierten Diethoxycarbenium-Tetrafluoroborat (1) zu den Indolcarbaldehyden …

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