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Šenica, Luka; Stopar, Karmen; Friedrich, Miha; Grošelj, Uroš; Plavec, Janez; Počkaj, Marta; Podlipnik, Črtomir; Štefane, Bogdan; Svete, Jurij
Journal of organic chemistry, 01/2016, Letnik: 81, Številka: 1Journal Article
Seven title compounds 12a–g and the (S)-prolinate analogue 13 were prepared in five steps from 2-nitrobenzoic acid (7). Reduction of the nitro group followed by derivatization of the so formed anilines 14 gave the N-alkyl-(15a–c), N-acyl-(16a,b and 19), and N-vinyl derivative 20. NMR spectra of (S)-alanine and (S)-proline derived compounds 12, 13, 14–16, 19, and 20 exhibited two sets of signals corresponding to pairs of conformational diastereomers. The free energy barriers of rotation, ΔG ‡ 298 = 82–86 kJ mol–1, were determined by 1H NMR for 12a, 12d, 12f, and 12g and evaluated by DFT calculations.
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