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Synthesis 2005(14): 2414-2420
DOI: 10.1055/s-2005-872074
DOI: 10.1055/s-2005-872074
PAPER
© Georg Thieme Verlag Stuttgart · New York
Synthesis of 3-EWG-Substituted 2-Amino-5-hydroxyindoles via Nenitzescu Reaction
Further Information
Received
7 February 2005
Publication Date:
20 July 2005 (online)
Publication History
Publication Date:
20 July 2005 (online)
Abstract
A series of primary ketene aminals 2, substituted with an electron-withdrawing group were reacted with 1,4-benzoquinone (1) yielding new 3-EWG-substituted 2-amino-5-hydroxyindoles 3a-f. Treatment of ethyl 3,3-diaminoacrylate (2a) with naphthoquinone (20a) and heteroaromatic quinones 20b-d afforded [g]annulated 2-aminoindole-3-carboxylates 21a-d.
Key words
indoles - quinones - Michael reaction - nucleophilic addition - Nenitzescu reaction
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