[CH2:1]([C:4]1[C:12]([OH:13])=[CH:11][CH:10]=[C:9]2[C:5]=1[CH:6]=[CH:7][NH:8]2)[CH:2]=[CH2:3].[CH2:14](Br)[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1.C([O-])([O-])=O.[Cs+].[Cs+]>CN(C=O)C.O>[CH2:1]([C:4]1[C:12]([O:13][CH2:14][C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)=[CH:11][CH:10]=[C:9]2[C:5]=1[CH:6]=[CH:7][NH:8]2)[CH:2]=[CH2:3]4-Allyl-1H-indol-5-ol (Example 54, 2.67 g, 15.4 mmol), benzyl bromide (2.90 g, 17.0 mmol), and Cs2CO3 (6.03 g, 18.5 mmol) were combined in DMF (50 mL), and water (15 drops) was added. After stirring for 12 h at rt, the reaction mixture was concentrated under reduced pressure. The residue was taken up in water, and the aqueous phase was extracted with EtOAc (2×). The combined organic phases were dried over Na2SO4, filtered, and concentrated under reduced pressure. Purification by silica gel flash chromatography (EtOAc/hexane (v/v)=1:7) gave 3.3 g (82%) of the title compound as a yellow oil. 1H NMR (400 MHz, CDCl3): δ 3.74 (d, 2H), 5.00 (d, 1H), 5.09 (d, 1H), 5.10 (s, 2H), 6.07 (m, 1H), 6.55 (s, 1H), 6.98 (d, 1H), 7.20 (m, 2H), 7.31 (m, 1H), 7.38 (m, 2H), 7.48 (m, 2H), 8.03 (br, 1H).
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