Stereocontrolled synthesis of 4,4,4-trifluorothreonine
摘要:
Stereoisomers of unnatural 4,4,4-trifluorothreonine are obtained through enzymatic resolution, and the absolute configuration of these materials is determined. 4,4,4-Trifluorothreonine thus prepared was evaluated for antifungal or antitumor activity.
Introduction of trifluoromethyl-containing threonine to the target hexapeptide, Tyr–d-Ser–Gly–Phe–Leu–Thr (DSLET), led to the apparent conformational alteration due to the electron-withdrawing effect of the CF3 group when compared with the original DSLET on the basis of their NOESY spectra.
Incorporation of (2S,3S)-4,4,4-trifluorothreonine (F-3-Thr) instead of Thr in the enkephalin-derived hexapeptide led to the apparent conformational alteration due to the strong electron-withdrawing effect of the trifluoromethyl group by comparison with the original compound on the basis of their various NMR measurements. (C) 2007 Elsevier Ltd. All rights reserved.
Soloshonok, Vadim A.; Kukhar, Valeri P.; Galushko, Sergei V., Journal of the Chemical Society. Perkin transactions I, 1993, # 24, p. 3143 - 3156
Asymmetric synthesis of heteroorganic analogs of natural compounds. 4. Diastereo- and enantioselective synthesis of (2s, 3s)-4,4,4-trifluorothreonine and (2s, 3s)-?-perfluoroalkylserines
作者:V. A. Soloshonok、V. P. Kukhar'、A. S. Batsanov、M. A. Galakhov、Yu. N. Belokon'、Yu. T. Struchkov
DOI:10.1007/bf00961234
日期:1991.7
Perfluorinated aliphatic aldehydes react with the Ni(II) complex of the glycine Schiff base with (S)-2-[N(N'-benzylprolyl)amino]benzophenone in the presence of MeONa to give (2S, 2S)-perfluoroalkylserines, while alkanals react to form (2R, 3S)-diastereomers.
Stereoselective preparation of ethyl 2,3-dihydroxy-4,4,4-trifluorobutyrates via enzymatic optical resolution