Reaktionsschritte
To a stirred solution of 3 (400 mg, 0.53 mmol) in CH3CN (30 mL) at rt was added Et2NH (1.5 mL). After stirring for 3 h at rt the reaction mixture was diluted with heptane (60 mL) and concentrated to give the crude amine as a colourless oil. To a stirred solution of Fmoc-D-alanine (198 mg, 0.636 mmol) in CH3CN (25 mL) was added EDAC.HCl (122.0 mg, 0.634 mmol), HOBt (86 mg, 0.636 mmol) and DIEA (502 μl, 1.91 mmol). After stirring at rt for 15 minutes the crude amine was then added and the reaction mixture stirred for 18 h, solvent removed and the residue dissolved up in CH2Cl2 (50 mL), washed with water (15 mL) 10% HCl (15 mL), 5% NaHCO3 (15 mL) and sat NaCl (15 mL) solutions, dried (Na2SO4), filtered, and solvent removed to give a off white solid which was recrystallised from CH3CN to give 4 as a white solid (670 mg, 81%): mp=195-197° C.; [α]22D +5.1 (c 0.50, CHCl3); IR νmax 3267, 3054, 1744, 1706, 1635, 1531.1 cm−1; 1H NMR 400 MHz 7.75 (d, J=7.5 Hz, 2H), 7.52 (d, J=7.0 Hz, 2H), 7.39 (m, 7H), 7.26-7.15 (m, 13H), 6.79 (s, 1H), 6.62 (s, 1H), 5.47 (s, 1H), 4.43-4.28 (m, 4H), 4.13 (m, 1H), 4.01 (m, 1H), 3.88 (s, 2H), 3.63 (s, 3H), 2.81 (m, 1H), 2.52 (m, 1H), 2.26, (m, 1H), 1.30 (d, J=6.0 Hz, 3H), 0.94 (d, J=6.0 Hz, 3H), 0.89 (d, J=7.0 Hz, 3H); 13C NMR 100 MHz 172.7, 171.1, 170.2, 156.1, 144.4, 143.9, 143.8, 141.4, 129.6, 128.3, 127.9, 127.2, 127.1, 125.1, 120.1, 58.5, 52.7, 52.3, 50.8, 47.2, 41.0, 33.5, 30.4, 19.3, 19.0, 17.7; MS m/z 849.2 (M+Na)+, 865.1 (M+K)+.
