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Using General Procedure A: To a stirred solution of 4-{[(1H-benzimidazol-2-ylmethyl)-(5,6,7,8-tetrahydro-quinolin-8-yl)-amino]-methyl}-benzaldehyde (140 mg, 0.34 mmol) and 2-aminobenzimidazole (45 mg, 0.0.34 mmol) in MeOH (4 mL) was added NaBH3CN (64 mg, 1.1 mmol) and the mixture was stirred at room temperature for 20 hours. Purification of the crude yellow foam by column chromatography on silica gel (200: 1:1—EtOAc:MeOH:NH4OH) followed by radial chromatography on silica gel (100:1:1—CH2Cl2:MeOH:NH4OH) afforded AMD9693 (26 mg, 15%) as a white solid. 1H NMR (CDCl3) δ 1.57-1.74 (m, 1H), 1.87-2.05 (m, 2H), 2.10-2.20 (m, 1H), 2.63-2.75 (m, 1H), 2.75-2.90 (m, 1H), 3.54 (s, 2H), 3.86 (d, 1H, J=16.8 Hz), 4.03-4.16 (m, 2H), 4.24-4.35 (m, 2H), 5.44 (br s, 1H), 6.88-6.91 (m, 4H), 7.10-7.19 (m, 7H), 7.42 (d, 1H, J=7.5 Hz), 7.54 (br s, 2H), 8.65 (d, 1H, J=4.2 Hz); 13C NMR (CDCl3) δ 21.16, 24.26, 29.10, 46.66, 48.40, 53.29, 60.62, 111.39 (br), 118.11 (br), 120.13, 121.81, 122.37, 127.22, 128.57, 133.86, 134.79, 137.41, 138.17, 143.78, 146.67, 155.56, 156.41, 157.20. ES-MS m/z 514.4 (M+H). Anal. Cald. for C32H31N7.0.8CH2Cl2.0.4C4H8O2: C, 66.98; H, 5.85; N, 15.90. Found: C, 67.14; H, 5.66; N, 15.87.
