[F:1][C:2]1[CH:3]=[C:4]([C:8]([C:13]2[N:21](S(C3C=CC=CC=3)(=O)=O)[C:16]3=[N:17][CH:18]=[CH:19][CH:20]=[C:15]3[CH:14]=2)=[CH:9][CH:10]([CH3:12])[CH3:11])[CH:5]=[CH:6][CH:7]=1.[OH-].[Na+]>C(O)C.O1CCCC1>[F:1][C:2]1[CH:3]=[C:4]([C:8]([C:13]2[NH:21][C:16]3=[N:17][CH:18]=[CH:19][CH:20]=[C:15]3[CH:14]=2)=[CH:9][CH:10]([CH3:12])[CH3:11])[CH:5]=[CH:6][CH:7]=1A solution of 2-(1-(3-fluoro-phenyl)-3-methyl-but-1-enyl)-1-(phenylsulfonyl)-1H-pyrrolo[2,3-b]pyridine (2.6 g, 6.2 mmol) in ethanol (8 mL) and tetrahydrofuran (15 mL) was treated with an aqueous sodium hydroxide solution (10%, 20 mL). The reaction was stirred at 80° C. for 16 h. At this time, the reaction mixture was cooled to 25° C. and the resulting precipitate was collected by filtration. The solids were washed with petroleum ether and diethyl ether and then dried under vacuum to afford 2-(1-(3-fluoro-phenyl)-3-methyl-but-1-enyl)-1H-pyrrolo[2,3-b]pyridine (1.2 g, 69%) as a white solid: 1H NMR (300 MHz, CDCl3) δ ppm 10.50 (s, 1H), 7.89 (dd, 1H, J1=4.8 Hz, J2=1.5 Hz), 7.84 (dd, 1H, J1=5.1 Hz, J2=1.5 Hz), 7.27-7.22 (m, 2H), 6.48 (d, 1H, J=2.1 Hz), 6.03 (d, 1H, J=10.5 Hz), 2.96-2.84 (m, 1H), 1.12 (s, 3H), 1.10 (s, 3H).
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