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0009668755
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Refs. 1-69 in the review 1a
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(f) Refs. 1-69 in the review 1a.
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21
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For recent reviews see: (a) Hruby, V. J.; Li, G.; Haskell-Luevano, C.; Shenderovich, M. D. Biopolimers 1997, 43, 219.
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0009696055
-
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note
-
Separation of the target amino acids from valine is usually achieved by bulb-to-bulb distillation, or by anion exchange chromatography under controlled pH conditions.
-
-
-
-
26
-
-
0009707518
-
-
note
-
The reactions of tert-butyl (S)-2-tert-butyl-3-methyl-4-oxo-1-imidazolidinecarboxylate (Boc-BMI) with methyl or ethyl crotonates afford a mixture of the corresponding 3-methylglutamic acid derivatives in 58% and 68% yield respectively; Diastereoselectivity of the reaction ranges from 20-40% de favoring (2S,3R)-configured diastereomers; for details see ref. 9.
-
-
-
-
28
-
-
0009748914
-
-
note
-
The stereochemistry of the products obtained in the reaction between rac-tert-butyl 2-tert-butyl-methoxy- 2,5-dihydroimidazole-1-carboxylate and 2,6-di-tert-butyl-4-methoxyphenylbut-2-enecarboxylate has not been assigned; for details see ref. 2b.
-
-
-
-
29
-
-
0009669290
-
-
note
-
Provided, of course, efficient procedures for preparing these derivatives and further release of a free carboxylic group.
-
-
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30
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3843128179
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El Achqar, A.; Boumzebra, M.; Roumestant, M.-L.; Viallefont, P. Tetrahedron 1988, 44, 5319.
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31
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0009697275
-
-
The relative amount of the fourth diastereomer has not been provided; see ref. 12
-
The relative amount of the fourth diastereomer has not been provided; see ref. 12.
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32
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0030239580
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Gestmann, D.; Laurent, A. J.; Laurent, E. G. J. Fluor. Chem. 1996, 80, 27.
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0032509547
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For an updated, improved large-scale preparation see: Belokon', Yu. N.; Tararov, V. I.; Maleev, V. I.; Savel'eva, T. F.; Ryzhov, M. G. Tetrahedron Asymmetry 1999, 9, 4249.
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(c) Kukhar' V. P.; Resnati, G.; Soloshonok, V. A. In Fluorine-Containing Amino Acids. Synthesis and Properties. Kukhar' V. P.; Soloshonok, V. A., Eds.; John Wiley and Sons Ltd.: Chichester, 1994; Chapter 5.
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0029163546
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For successive papers see: (e) Soloshonok, V. A.; Avilov, D. V.; Kukhar', V. P.; Tararov, V. I.; Savel'eva, T. F.; Churkina, T. D.; Ikonnikov, N. S.; Kochetkov, K. A.; Orlova, S. A.; Pysarevsky, A. P.; Struchkov, Yu. T.; Raevsky, N. I.; Belokon', Yu. N. Tetrahedron: Asymmetry 1995, 6, 1741.
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0029883406
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(f) Soloshonok, V. A.; Avilov, D. V.; Kukhar', V. P. Tetrahedron: Asymmetry 1996, 7, 1547.
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37049073251
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Belokon', Yu. N.; Bulychev, A. G.; Ryzhov, M. G.; Vitt, S. V.; Batsanov, A. S.; Struchkov, Yu. T.; Bakhmutov, V. I.; Belikov, V. M. J. Chem. Soc. Perkin Trans. 1 1986, 1865.
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37049076259
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(b) Belokon', Yu. N.; Bulychev, A. G.; Pavlov, V. A.; Fedorova, E. B.; Tsyryapkin, V. A.; Bakhmutov, V. I.; Belikov, V. M. J. Chem. Soc. Perkin Trans. 1 1988, 2075.
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45
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0009706495
-
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note
-
3/acetone or acetone/n-hexane).
-
-
-
-
46
-
-
0009672473
-
-
note
-
1H-NMR spectra of the complexes containing α-(L)- and α-(D)-amino acids also are very characteristic featuring substantial difference in chemical shifts of aromatic and methylene protons of the (N-benzyl)proline moiety.
-
-
-
-
47
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37049101857
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Belokon', Yu. N.; Maleyev, V. I.; Vitt, S. V.; Ryzhov, M. G.; Kondrashov, Yu. D.; Golubev, S. N.; Vauchskii, Yu. P.; Kazika, A. I.; Novikova, M. I.; Krasutskii, P. A.; Yurchenko, A. G.; Dubchak, I. L.; Shklover, V. E.; Struchkov, Yu. T.; Bakhmutov, V. I.; Belikov, V. M. J. Chem. Soc., Dalton Trans. 1985, 17.
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Novikova, M.I.9
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0009668137
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For discussions on the stereochemical properties of fluorine-containing substituents and trifluoromethyl group, in particular, see ref. 23
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For discussions on the stereochemical properties of fluorine-containing substituents and trifluoromethyl group, in particular, see ref. 23.
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