[N+:1]([C:4]1[CH:5]=[C:6]2[C:10](=[CH:11][CH:12]=1)[NH:9][CH:8]=[C:7]2[C:13]1[CH2:18][CH2:17][C:16](=O)[CH2:15][CH:14]=1)([O-:3])=[O:2].Cl.[CH3:21][NH:22][CH3:23].CC(O)=O.[BH-](OC(C)=O)(OC(C)=O)OC(C)=O.[Na+]>ClCCCl.[OH-].[Na+]>[CH3:21][N:22]([CH3:23])[CH:16]1[CH2:17][CH2:18][C:13]([C:7]2[C:6]3[C:10](=[CH:11][CH:12]=[C:4]([N+:1]([O-:3])=[O:2])[CH:5]=3)[NH:9][CH:8]=2)=[CH:14][CH2:15]1A solution of compound 79 (1.0 g, 3.902 mmol) in dry 1,2-dichloroethane (10 mL) was treated with N,N-dimethyl amine hydrochloride (0.31 g, 3.902 mmol), AcOH (0.22 mL, 3.902 mmol), NaBH(OAc)3 (1.24 g, 5.853 mmol) at room temperature and the resulting mixture was stirred for overnight (14 h). The reaction was diluted with 1 N NaOH (30 mL) and product was extracted into ethyl acetate (2×50 mL). The combined ethyl acetate layer was washed with brine (20 mL) and dried (Na2SO4). Solvent was evaporated and crude was purified by column chromatography (2 M NH3 in methanol: CH2Cl2, 1:9) to obtain compound 112 (0.73 g, 66%) as a brown solid. mp 234-236° C.; 1H NMR (DMSO-d6) δ 1.43-1.57 (m, 1H), 1.98-2.06 (m, 1H), 2.12-2.23 (m, 7H), 2.39-2.62 (m, 4H), 6.15 (t, 1H, J=1.5 Hz), 7.54 (d, 1H, J=9.0 Hz), 7.62 (s, 1H), 8.00 (dd, 1H, J=2.1, 9.0 Hz), 8.67 (d, 1H, J=2.1 Hz), 11.82 (s, 1H); ESI-MS m/z (%): 286 (MH+, 100).
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