Synthesis 2005(14): 2414-2420  
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

Jens Landwehr, Reinhard Troschütz*
Institut für Pharmazie und Lebensmittelchemie im Emil-Fischer-Centrum, Friedrich-Alexander-Universität, Schuhstr. 19, 91052 Erlangen, Germany
Fax: +49(9131)8522587; e-Mail: Troschuetz@pharmazie.uni-erlangen.de;
Further Information

Publication History

Received 7 February 2005
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.