Triphenylphosphine → 3-chloro-6-(4-(2-(4-methylpiperazin-1-yl)ethoxy)phenyl)-9-(benzenesulfonyl)-9H-pyrido[2,3-b]indole

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Reaction Steps

To a solution of 4-(3-chloro-9-(benzenesulfonyl)-9H-pyrido[2,3-b]indol-6-yl)phenol (240 mg, 0.55 mmol, 1 equiv.) in anhydrous THF (14 ml), triphenylphosphin (577 mg, 2.2 mmol, 4 equiv.) and 2-(4-methylpiperazin-1-yl)ethanol (397 mg, 2.75 mmol, 5 equiv.) are added. DIAD (445 mg, 2.2 mmol, 4 equiv.) is then added dropwise to the solution which is stirred at room temperature for 12 hours. The mixture is then extracted with a solution of HCl 0.1M (3×10 ml). The aqueous layer is treated with Na2CO3 until pH=9 and then extracted with AcOEt (3×20 ml). The organic layers are dried over MgSO4, filtered and concentrated under reduced pressure. The residue (yellow solid) is purified over silica chromatography (eluted with AcOEt/MeOH 9:1 and then THF/MeOH 9:1) to give the product as a white solid (259 mg, 0.44 mmol) in 80% yield. 1H NMR (300 MHz, CDCl3) δ 8.47 (dd, 2H, J=2.5, 7.7 Hz), 8.17 (d, 1H, J=2.1 Hz), 8.13 (d, 2H, J=7.5 Hz), 8.00 (d, 1H, J=0.9 Hz), 7.76 (dd, 1H, J=1.5, 8.6 Hz), 7.57-7.39 (m, 5H), 7.55 (d, 2H, J=8.6 Hz), 7.01 (d, 2H, J=8.5 Hz), 4.17 (t, 2H, J=5.6 Hz), 2.87 (t, 2H, J=5.6 Hz), 2.70-2.58 (br d, 8H), 2.35 (s, 3H).

Provenance & Evidence