[OH:1][C:2]1[CH:3]=[C:4]([O:14][C:15]2[CH:16]=[N:17][C:18]([S:21]([CH3:24])(=[O:23])=[O:22])=[CH:19][CH:20]=2)[CH:5]=[C:6]2[C:10]=1[NH:9][C:8]([C:11]([OH:13])=[O:12])=[CH:7]2.Cl.O.[CH3:27]O>C1(C)C=CC=CC=1>[OH:1][C:2]1[CH:3]=[C:4]([O:14][C:15]2[CH:16]=[N:17][C:18]([S:21]([CH3:24])(=[O:23])=[O:22])=[CH:19][CH:20]=2)[CH:5]=[C:6]2[C:10]=1[NH:9][C:8]([C:11]([O:13][CH3:27])=[O:12])=[CH:7]2To a solution of 7-hydroxy-5-{[6-(methylsulfonyl)pyridin-3-yl]oxy}-1H-indole-2-carboxylic acid (4.7 g) in a mixture of methanol (30 mL) and toluene (90 mL) was added dropwise 2M trimethylsilyldiazomethane diethyl ether solution (7.4 mL) at 0° C. The mixture was stirred at 0° C. for 30 min, and 2M trimethylsilyldiazomethane diethyl ether solution (3.7 mL) was added dropwise to the mixture. After stirring at 0° C. for 30 min, 1M hydrochloric acid (2 mL) was added to the mixture to quench the reaction. Water was added to the mixture and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over magnesium sulfate, filtered and concentrated. The residual yellow oil was solidified with ethyl acetate-diethyl ether. The resulting solid was washed with diethyl ether to give the title compound (3.6 g, 74%) as a pale orange solid. MS 363 (MH+).
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