[CH3:1][O:2][C:3](=[O:15])[CH:4]=[CH:5][C:6]1[CH:14]=[C:13]2[C:9]([CH:10]=[CH:11][NH:12]2)=[CH:8][CH:7]=1.[CH3:16][O:17][C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][C:19]=1B(O)O>O.O1CCOCC1>[CH3:1][O:2][C:3](=[O:15])[CH2:4][CH:5]([C:6]1[CH:14]=[C:13]2[C:9]([CH:10]=[CH:11][NH:12]2)=[CH:8][CH:7]=1)[C:19]1[CH:20]=[CH:21][CH:22]=[CH:23][C:18]=1[O:17][CH3:16]A mixture of 3-(1H-indol-6-yl)-acrylic acid methyl ester XXX (1.0 g, 5.0 mmol), 2-methoxyphenyl boronic acid (1.1 g, 7.2 mmol), [RhCl(cod)]2 (110 mg, 0.25 mmol) and TEA (5 mmol) in H2O (14 ml) and 1,4-dioxane (1 ml) was stirred at 90° C. in a sealed vial for 6 hours. The reaction mixture was cooled to room temperature and extracted with EtOAc. The combined organic layers were dried over MgSO4, filtered, concentrated, and purified via flash chromatography (hexane/acetone) to provide 3-(1H-indol-6-yl)-3-(2-methoxy-phenyl)-propionic acid methyl ester XXXVII (300 mg, 20% yield) as a yellow film.
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