Reaction Steps
To a solution of (2,5-dimethoxy-4-(6-(4-(4-methylpiperazin-1-yl)phenyl)-9H-pyrido[2,3-b]indol-4-yl)phenyl)(phenyl)methanone (example 50, 39.8 mg, 0.0683 mmol) in CH2Cl2/MeOH 5:2 (2 mL), NaBH4 (6 mg, 2.3 eq) was added. After stirring for 1 h20 at r.t., the reaction mixture was quenched with sat. aq. NH4Cl (5 mL), diluted with CH2Cl2 (25 mL) and washed with water (30 mL) The organic layer was collected and the aqueous layer washed four times with CH2Cl2 (20 mL) The combined organic layers were washed with brine and dried over MgSO4, filtered and evaporated to dryness. A white solid was obtained in 66% yield (26.3 mg) after trituration of the crude product in DCM and filtration. 1H NMR (300 MHz, DMSO, 80° C.) δ 11.61 (s, 1H), 8.41 (d, J=5.0 Hz, 1H), 7.63 (dd, J=8.4, 1.9 Hz, 1H), 7.51 (d, J=8.4 Hz, 1H), 7.49-7.41 (m, 4H), 7.35-7.15 (m, 5H), 7.08 (d, J=5.0 Hz, 1H), 7.02 (s, 1H), 6.98-6.79 (m, 2H), 6.11 (d, J=4.9 Hz, 1H), 5.67 (d, J=5.4 Hz, 1H), 3.69 (s, 3H), 3.62 (s, 3H), 3.24-3.14 (m, 4H), 2.54-2.47 (m, 4H), 2.27 (s, 3H); 13C NMR (75 MHz, DMSO, 80° C.) δ 152.2 (C), 150.2 (C), 149.6 (C), 149.2 (C), 145.2 (CH), 144.8 (C), 140.6 (C), 137.6 (C), 135.1 (C), 131.0 (C), 131.0 (C), 127.5 (CH), 126.3 (CH), 126.2 (CH), 126.1 (CH), 125.9 (C), 124.3 (CH), 121.8 (C), 120.7 (C), 118.6 (CH), 116.1 (CH), 115.3 (CH), 113.4 (CH), 111.0 (CH), 110.6 (CH), 68.1 (CH), 55.9 (OCH3), 55.8 (OCH3), 54.3 (2CH2), 47.8 (2CH2), 45.3 (NCH3); MS (ESI) m/z: 585.5 [M+H]+; 1170.1 [2M+H]+; 567.3 [M-OH]+; HRMS calcd for C37H37N4O3 [M+H]+ 585.2860 found 585.2868.
