Synthesis 2005(17): 2969-2988  
DOI: 10.1055/s-2005-916072
FEATUREARTICLE
© Georg Thieme Verlag Stuttgart · New York

Synthesis of N-Substituted 3-Aminomethylidenetetramic Acids

Samo Pirc, David Bevk, Renata Jakše, Simon Rečnik, Ljubo Golič, Amalija Golobič, Anton Meden, Branko Stanovnik*, Jurij Svete*
Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, 1000 Ljubljana, Slovenia
Fax: +386(1)2419220; e-Mail: branko.stanovnik@fkkt.uni-lj.si; e-Mail: jurij.svete@fkkt.uni-lj.si;
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Publication History

Received 30 May 2005
Publication Date:
23 September 2005 (online)

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Abstract

(S)-3-(Dimethylamino)methylidene-5-benzyltetramic acid derivatives 4a and 4b were prepared in three steps from N-protected (S)-3-phenylalanines 1a and 1b, respectively. Similarly, N-[N-(benzyloxycarbonyl)glycyl]glycine (1c) was transformed into the enaminone 4c. Acid-catalysed coupling of enaminones 4a-c with aliphatic, aromatic, and heteroaromatic primary amines 5-34 afforded the corresponding N(3′)-substituted 3-aminomethylidenetetramic acid derivatives 35-64 in 29-96% yields.

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