Gold-catalyzed reactions of 2-alkynyl-phenylamines with alpha,beta-enones |
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Authors: | Alfonsi Maria Arcadi Antonio Aschi Massimiliano Bianchi Gabriele Marinelli Fabio |
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Institution: | Dipartimento di Chimica, Ingegneria Chimica e Materiali, Facoltà di Scienze, Università di L'Aquila, Via Vetoio, 67010 Capitol (AQ), Italy. |
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Abstract: | reaction: see text] The gold-catalyzed reaction of 2-alkynyl-phenylamines with alpha,beta-enones represents a new general one-pot entry into C-3-alkyl-indoles by sequential reactions. Gold-catalyzed sequential cyclization/alkylation, N-alkylation/cyclization, or N-alkylation/cyclization/alkylation reactions leading to different indoles can be directed by changing the 2-alkynyl-phenylamine 1/alpha,beta-enone 3 ratio and the reaction temperature. Unusual gold-catalyzed rearrangement reaction of indoles are observed at 140 degrees C. New gold-catalyzed formation of propargyl-alkyl ether under mild conditions and the hydration reaction of N-acetyl-2-ethynyl-phenylamine are reported. |
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