Unconjugated chiral azomethines; structure of N-isobutylidene derivatives of (S)-.ALPHA.-amino acid esters.

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Abstract

Unconjugated chiral azomethines, N-isobutylidene derivatives of (S)-α-amino acid esters (I-VI) were synthesized. The structures of these compounds were confirmed by the infrared, mass spectrum and nuclear magnetic resonance (NMR) spectra. The conformations were discussed by the NMR spectra. The characteristic absorption band for the unconjugated chiral azomethine compounds were observed nearly at 240 nm by the circular dichroism spectra.

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