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DOI: 10.1055/s-2005-916072
Synthesis of N-Substituted 3-Aminomethylidenetetramic Acids
Publication History
Publication Date:
23 September 2005 (online)
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.
Key words
amines - chiral pool - coupling - heterocycles - enaminones
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References
The final atomic and geometrical parameters, crystal data and details concerning data collection and refinement for both compounds have been deposited with the Cambridge Crystallographic Data Centre as supplementary material with the deposition numbers: CCDC 272155 & 272156, respectively. These data can be obtained, free of charge via http://www.ccdc.cam.ac.uk/conts/retrieving.html.