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For the synthesis of other proline-derived triazoles by azide-alkyne cycloadditions, see: a
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For the synthesis of other proline-derived triazoles by azide-alkyne cycloadditions, see: (a) Yan, Z.-Y.; Niu, Y.-N.; Wei, H.-L.; Wu, L.-Y.; Zhao, Y.-B.; Liang, Y.-M. Tetrahedron: Asymmetry 2006, 17, 3288.
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36549064557
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During our study, the preparation of racemic α-trifluoromethyl azahistidine analogues using the same approach has been reported: Shchetnikov, G. T.; Peredukov, A. S.; Osipov, S. N. Synlett 2007, 136.
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During our study, the preparation of racemic α-trifluoromethyl azahistidine analogues using the same approach has been reported: Shchetnikov, G. T.; Peredukov, A. S.; Osipov, S. N. Synlett 2007, 136.
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29
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33748725421
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A related compound of 5 (NBoc instead of NCbz) has been previously prepared in racemic form by propargylation of Boc-Pro-OMe: Ikeda, M.; Kugo, Y.; Kondo, Y.; Yamazaki, T.; Sato, T. J. Chem. Soc., Perkin Trans. 1 1997, 3339.
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A related compound of 5 (NBoc instead of NCbz) has been previously prepared in racemic form by propargylation of Boc-Pro-OMe: Ikeda, M.; Kugo, Y.; Kondo, Y.; Yamazaki, T.; Sato, T. J. Chem. Soc., Perkin Trans. 1 1997, 3339.
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30
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36549062340
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1-Benzyl 2-Methyl (2R)-2-Prop-2-ynylpyrrolidine-1,2- dicarboxylate (4, To a solution of compound 5 (0.56 mmol, 197 mg) in MeOH (3 mL) in a microwave reaction tube was added TMSCl (2.89 mmol, 365 μL, The mixture was stirred for 2.5 h at 40°C using an irradiation power of 150 W with simultaneous cooling of the reaction vessel with a stream of compressed air. The solvent was removed under reduced pressure, and a sat. solution of NaHCO3 (3 mL) was added followed by carbobenzyloxy chloride (CbzCl, 0.62 mmol, 87 μL) at 0°C. The reaction mixture was allowed to warm to r.t, stirred overnight at r.t, and diluted with EtOAc. The two layers were separated, the aqueous layer was extracted with EtOAc and the combined organic layers were dried over Na2SO4, filtered, and concentrated under reduced pressure. The crude product was purified by chromatography on silica gel (eluent: PE-Et2O, 1:1) to give pure 7
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4: C, 67.76; H, 6.36; N, 4.65. Found: C, 67.57; H, 6.63; N, 4.93.
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34
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0000579839
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(a) Szarek, W. A.; Achmatowicz, O. Jr.; Plenkiewicz, J.; Radatus, B. K. Tetrahedron 1978, 34, 1427.
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35
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23444448949
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(b) Esteves, A. P.; Rodrigues, L. M.; Silva, M. E.; Gupta, S.; Oliveira-Campoça, A. M. F.; Machalickyb, O.; Mendonça, A. J. Tetrahedron 2005, 62, 8625.
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Mendonça, A.J.7
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36
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36549065052
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4, filtered, and concentrated under reduced pressure. The crude product was purified by chromatography on silica gel to afford analytically pure proline 9.
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4, filtered, and concentrated under reduced pressure. The crude product was purified by chromatography on silica gel to afford analytically pure proline 9.
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37
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36549036055
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1-Benzyl 2-Methyl (2R)-2, 1-(4-Ethoxy-4-oxobutyl)-1H-1,2,3-triazol-4-yl]methyl}pyrrolidine-1,2-dicarboxylate (9c, Rf0.28 (PE-Et2O, 1:1, 1H NMR (400 MHz, DMSO-d6, 110°C, δ, 7.52 (s, 1 H, triazole, 7.29-7.41 (m, 5 H, Ph, 5.12 (s, 2 H, CH2Ph, 4.34 (t, J, 6.9 Hz, 2 H, NCH2CH2CH2CO 2Et, 4.08 (q, J, 7.1 Hz, 2 H, CH2CH 3, 3.63 (br s, 3 H, OMe, 3.46-3.58 [m, 2 H, C(2)CHH, 5-Ha, 3.23 [d, J, 14.6 Hz, 1 H, C(2)CHH, 3.02-3.10 (m, 1 H, 5-H b, 2.24-2.32 (m, 1 H, 3-Ha, 2.27 (t, J, 7.3 Hz, 2 H, CH2CO2Et, 2.02-2.10 (m, 3 H, 3-Hb, CH2CH2CO2Et, 1.67-1.79 (m, 1 H, 4-Ha, 1.29-1.41 (m, 1 H, 4-Hb, 1.20 t, J, 7.1 Hz, 3
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6: C, 60.25; H, 6.59; N, 12.22. Found: C, 59.98; H, 6.90; N, 11.98.
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38
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4544344028
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For previous examples of triazole-linked glycosyl amino acids and peptides, see: (a) Kuijpers, B. H. M.; Groothuys, S.; Keereweer, A. (B.) R.; Quaedflieg, P. J. L. M.; Blaauw, R. H.; van Delft, F. L.; Rutjes, F. P. J. T. Org. Lett. 2004, 6, 3123.
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For previous examples of triazole-linked glycosyl amino acids and peptides, see: (a) Kuijpers, B. H. M.; Groothuys, S.; Keereweer, A. (B.) R.; Quaedflieg, P. J. L. M.; Blaauw, R. H.; van Delft, F. L.; Rutjes, F. P. J. T. Org. Lett. 2004, 6, 3123.
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