[OH:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[CH:4]=[C:5]([C:12]([OH:14])=[O:13])[N:6]2[CH3:11].C(N(CC)CC)C.[C:22](Cl)(=[O:24])[CH3:23]>ClCCl>[C:22]([O:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[CH:4]=[C:5]([C:12]([OH:14])=[O:13])[N:6]2[CH3:11])(=[O:24])[CH3:23]To 4-hydroxy-1-methyl-1H-indole-2-carboxylic acid (0.262 mmol, 50 mg) in dichloromethane (1 ml) and triethylamine (2.62 mmol, 365 μl) at 0° C. was added acetyl chloride (0.266 mmol, 19 μl) and the reaction mixture stirred at room temperature for one hour. The reaction was quenched with saturated aqueous sodium hydrogencarbonate and extracted twice with dichloromethane. The organic layers were combined, dried (Na2SO4) and concentrated under reduced pressure to yield 4-acetoxy-1-methyl-1H-indole-2-carboxylic acid (67 mg).
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