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Utility of commercial activated zinc dust to deprotonate amine hydrochloride salts is documented. Sureshbabu et al. demonstrated the conversion of amino acid/peptide acid ester hydrochloride salts into the corresponding free amines, see: (a) Sureshbabu, V. V.; Ananda, K. J. Pept. Res. 2001, 57, 223.
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Utility of commercial activated zinc dust to deprotonate amine hydrochloride salts is documented. Sureshbabu et al. demonstrated the conversion of amino acid/peptide acid ester hydrochloride salts into the corresponding free amines, see: (a) Sureshbabu, V. V.; Ananda, K. J. Pept. Res. 2001, 57, 223.
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(b) For the use of zinc dust as HCl scavenger in peptide synthesis via N-Fmoc amino acid chlorides under non-Schotten-Baumann conditions, see: Gopi, H. N.; Sureshbabu, V. V. Tetrahedron Lett. 1998, 39, 9769.
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32
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For a similar application in N-Boc-Z-Fmoc amino acid fluoride couplings under neutral conditions, see: Sureshbabu, V. V.; Ananda, K. Lett. Pept. Sci. 2000, 7, 41.
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(c) For a similar application in N-Boc-Z-Fmoc amino acid fluoride couplings under neutral conditions, see: Sureshbabu, V. V.; Ananda, K. Lett. Pept. Sci. 2000, 7, 41.
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33
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0009453990
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For the preparation of oligomer-free Z-amino acids employing ZCl/Zn dust, see: Gopi, H. N.; Ananda, K.; Sureshbabu, V. V. Protein Pept. Lett. 1999, 6, 233.
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(d) For the preparation of oligomer-free Z-amino acids employing ZCl/Zn dust, see: Gopi, H. N.; Ananda, K.; Sureshbabu, V. V. Protein Pept. Lett. 1999, 6, 233.
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2O to afford the urea as a colorless crystalline solid.
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2O to afford the urea as a colorless crystalline solid.
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35
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62249128584
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Selected Spectroscopic Data Fmoc-Val-ψ(NH-CO-NH)-Leu-OBzl (2b, white solid, mp 184°C. 1H NMR (300 MHz, DMSO, δ, 0.92 (12 H, m, 1.32-1.85 (4 H, m, 3.10 (2 H, s, 3.70-3.80 (2 H, m, 4.20 (1 H, t, 4.42 (2 H, m, 5.10 (1 H, d, 6.60-6.70 (2 H, m, 7.20-7.85 (13 H, m, 13C NMR (200 MHz, DMSO, δ, 18.5, 19.5, 22.0, 23.1, 24.5, 29.2, 40.3, 47.2, 59.0, 66.6, 120.0, 125.1, 126.5, 127.0, 127.2, 128.4, 129.3, 137.6, 141.2, 144.0, 155.4, 156.8, 176.4. HRMS: m/z calcd for C33H39N3NaO5: 580.2787; found: 580.2774 [M, Na, Z-Gly-ψ(NH-CO-NH)-Val-OMe (2d, Off-white solid, mp 159°C. 1H NMR (300 MHz, DMSO, δ, 0.93 (6 H, d, 3.14 (1 H, m, 3.58 (3 H, s, 4.51 (3 H, m, 5.30 (2 H, s, 6.10 (2 H, m, 6.48 (1 H, t, 7.20-7.40 (3 H, m, 13C NMR 200 MHz, DMSO, δ, 17.1, 31.1, 52.1, 56.2, 57.8, 65.4, 127.1, 127.2, 128.5, 141.2, 156.8, 157
-
8: 473.1900; found: 473.1918 [M + Na].
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36
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62249144006
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4 buffer were added and the reaction mixture was warmed to 35°C. Sodium chlorite and bleach were added, and the reaction mixture was stirred till completion of reaction. A simple workup lead to the isolation of the desired sugar-6-acid. See: Jhao, M.; Li, J.; Mano, E.; Song, Z.; Tschaen, D. M.; Grabowski, E. J. J.; Reider, P. J. J. Org. Chem. 1999, 64, 2564.
-
4 buffer were added and the reaction mixture was warmed to 35°C. Sodium chlorite and bleach were added, and the reaction mixture was stirred till completion of reaction. A simple workup lead to the isolation of the desired sugar-6-acid. See: Jhao, M.; Li, J.; Mano, E.; Song, Z.; Tschaen, D. M.; Grabowski, E. J. J.; Reider, P. J. J. Org. Chem. 1999, 64, 2564.
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