From Quinoxaline, Pyrido[2,3-b]pyrazine and Pyrido[3,4-b]pyrazine to Pyrazino-Fused Carbazoles and Carbolines

Abstract : 2,3-Diphenylated quinoxaline, pyrido[2,3-b]pyrazine and 8-bromopyrido[3,4-b]pyrazine were halogenated in deprotometalation-trapping reactions using mixed 2,2,6,6-tetramethyl piperidino-based lithium-zinc combinations in tetrahydrofuran. The 2,3-diphenylated 5-iodo- quinoxaline, 8-iodopyrido[2,3-b]pyrazine and 8-bromo-7-iodopyrido[3,4-b]pyrazine thus obtained were subjected to palladium-catalyzed couplings with arylboronic acids or anilines, and possible subsequent cyclizations to afford the corresponding pyrazino[2,3-a]carbazole, pyrazino[2',3'5,6] pyrido[4,3-b]indole and pyrazino[2',3'4,5]pyrido[2,3-d]indole, respectively. 8-Iodopyrido[2,3-b] pyrazine was subjected either to a copper-catalyzed C-N bond formation with azoles, or to direct substitution to introduce alkylamino, benzylamino, hydrazine and aryloxy groups at the 8 position. The 8-hydrazino product was converted into aryl hydrazones. Most of the compounds were evaluated for their biological properties (antiproliferative activity in A2058 melanoma cells and disease-relevant kinase inhibition).
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Molecules, MDPI, 2018, 23 (11), 〈10.3390/molecules23112961〉
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01937243
Contributeur : Laurent Jonchère <>
Soumis le : mercredi 28 novembre 2018 - 09:14:58
Dernière modification le : samedi 16 mars 2019 - 01:56:42

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Frédéric Lassagne, Timothy Langlais, Elsa Caytan, Emmanuelle Limanton, Ludovic Paquin, et al.. From Quinoxaline, Pyrido[2,3-b]pyrazine and Pyrido[3,4-b]pyrazine to Pyrazino-Fused Carbazoles and Carbolines. Molecules, MDPI, 2018, 23 (11), 〈10.3390/molecules23112961〉. 〈hal-01937243〉

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