S 89 Structure and properties of 4-amino derivatives of 5-oxoproline [Text] / V. P. Krasnov, I. A. Nizova, A. Yu. Vigorov, T. V. Matveeva, G. L. Levit, P. A. Slepukhin, M. A. Ezhikova, M. I. Kodess // European Journal of Organic Chemistry. - 2008. - № 10. - P1802-1810 Рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: On the basis of the results obtained from NMR spectroscopy, X-ray analysis and chemical transformations, it was established that acidic hydrolysis of (2S,4S)-4-arylaminoglutamates results in the formation of lactams in which ring closure occurs with the participation of the Y-amino and alfa-COOH groups; but isomeric lactams resulting from the participation of the alfa-amino and Y-COOH groups are not formed. Isomeric lactams, that is, (2S,4S)-4-arylamino-5-oxoprolines, can be easily converted in acidic medium into more stable 4-amino-1-aryl-5-oxoprolines. |