Triphenylphosphine → 5-(12-fluoro-6,7-dihydro-5H-pyrido[2',3':3,4]azepino[1,2-a]indol-2-yl)-2-(4-fluorophenyl)-N-methyl-6-(N-methylmethylsulfonamido)benzofuran-3-carboxamide

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To a solution of 5-(6-(4-fluoro-1H-indol-2-yl)-5-(3-hydroxypropyl)pyridin-2-yl)-2-(4-fluorophenyl)-N-methyl-6-(N-methylmethylsulfonamido)benzofuran-3-carboxamide (153 mg, 0.237 mmol) and triphenylphosphine (62.2 mg, 0.237 mmol) in THF was added diisopropyl azodicarboxylate (0.046 mL, 0.237 mmol). The resultant mixture was stirred at ambient temperature for 10 h then was concentrated in vacuo and the residue purified by silica gel column chromatography using a step gradient of 0-50-100% EtOAc/Hexanes as eluent. 1H NMR δ (ppm) (CHCl3-d): 8.07 (1H, s), 8.02 (2H, dd, J=8.61, 5.32 Hz), 7.75 (1H, d, J=7.78 Hz), 7.70 (1H, s), 7.60 (1H, d, J=7.77 Hz), 7.26˜7.0 (4H, m), 7.09 (1H, s), 6.85˜6.81 (1H, m), 5.98 (1H, br s), 4.23 (2H, t, J=6.66 Hz), 3.35 (3H, s), 3.03 (3H, d, J=4.90 Hz), 2.85 (2H, t, J=7.00 Hz), 2.80 (3H, s), 2.47˜2.42 (2H, m), MS (M+H)+: 627.

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