Sodium → N-(2-Hydroxymethylthiazolo[5,4-b]pyrid-6-yl)-5-fluoro-1-[(3-fluorophenyl)methyl]-1H-indole-2-carboxamide

50 mg (2.03 mmol) of sodium are added to 8 mL of methanol with stirring at 20° C. After 15 minutes, a solution of 0.15 g (0.28 mmol) of [6-[[[5-fluoro-1-[(3-fluorophenyl)methyl]-1H-indol-2-yl]carbonyl]amino]thiazolo[5,4-b]pyrid-2-yl]methyl 2,2-dimethylpropanoate (Compound 13), prepared in step 4.3, in 16 mL of methanol is added. Stirring is continued for 15 minutes at 20° C., and the reaction mixture is then concentrated under reduced pressure and taken up in 200 mL of molar ammonium chloride solution. The aqueous phase is extracted three times with 50 mL of ethyl acetate. The organic phases are combined, washed with 50 mL of saturated sodium chloride solution and then dried over sodium sulfate and concentrated under reduced pressure. The product thus obtained is purified on a column of silica, eluting with a mixture of dichloromethane and methanol. 70 mg of the expected product are thus isolated.