[NH2:1][C:2]1[CH:11]=[CH:10][C:5]2[N:6]=[C:7]([Cl:9])[S:8][C:4]=2[CH:3]=1.[CH:12](=O)[CH2:13][CH2:14][CH3:15].C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C(O)(=O)C>ClC(Cl)C.O>[Cl:9][C:7]1[S:8][C:4]2[CH:3]=[C:2]([NH:1][CH2:12][CH2:13][CH2:14][CH3:15])[CH:11]=[CH:10][C:5]=2[N:6]=1To a solution of (29) (0.2 mmol, 36.8 mg) in 2 ml dichloroethane was added 0.2 mmol butyraldehyde (18 μl), followed by 63.6 mg sodium triacetoxyborohydride, and 12 μl acetic acid. After 2 h, the solution was poured into water and extracted with ethyl acetate. The combined extracts were washed with water, dried over sodium sulfate, and the solvent removed by rotary evaporation, yielding 44.2 mg of a yellow solid. 1H-NMR (CDCl3): δ 7.67 (d, 1H, J=9.2 Hz), 6.84 (d, 1H, 3=2.4 Hz), 6.72 (dd, 1H, 3=2.4, 9.2 Hz), 3.35 (bt, 1H), 3.15 (t, 2H), 1.65 (m, 2H), 1.45 (m, 2H), 0.97 (t, 3H, J=7.6 Hz).
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