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Synthesis 2005(17): 2969-2988
DOI: 10.1055/s-2005-916072
DOI: 10.1055/s-2005-916072
FEATUREARTICLE
© Georg Thieme Verlag Stuttgart · New York
Synthesis of N-Substituted 3-Aminomethylidenetetramic Acids
Further Information
Publication History
Received
30 May 2005
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