Water → 2-[(Aminocarbonyl)amino]-6-ethynylindole-3-carboxamide

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1.0 M Tetrabutylammonium fluoride tetrahydrofuran solution (15 mL, 15 mmol) was added to a solution of 2-aminocarbonylamino-6-triisopropylsilylethynylindole-3-carboxamide (Compound 9-15, 4.0 g, 10 mmol) in anhydrous tetrahydrofuran (180 mL), and the mixture was stirred at 75° C. for 2.5 hours. Water (180 mL) was added to the reaction mixture, and the whole was extracted with ethyl acetate (180 mL). The organic layer was washed with brine (180 mL), and dried over anhydrous magnesium sulfate. After the solvent was evaporated under reduced pressure, the resultant solid was washed with a solution mixture of ethanol and chloroform (ethanol/chloroform=1/3, 55 mL) and dried under reduced pressure to give the title compound (2.2 g) as a slightly brown solid (yield 90%).

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