Potassium Hydroxide → 2-[(2-{[1-(N,N-dimethylglycyl)-5-(methyloxy)-2,3-dihydro-1H-indol-6-yl]amino}-5-fluoro-1H-pyrrolo[2,3-d]pyrimidin-4-yl)amino]-6-fluoro-N-methylbenzamide

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A solution of 2-({2-{[1-(N,N-dimethylglycyl)-5-(methyloxy)-2,3-dihydro-1H-indol-6-yl]amino}-5-fluoro-7-[(4-methylphenyl)sulfonyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl}amino)-6-fluoro-N-methylbenzamide (102 mg, 0.15 mmol) in dioxane (10 mL) and a 1N aqueous KOH solution (2 mL, 2.0 mmol) was heated at 80° C. for 6 h. The resulting mixture was allowed to cool to rt and diluted with EtOAc (50 mL) and a saturated NaHCO3 solution (50 mL). The organic layer was washed with a saturated NaCl solution (50 mL), concentrated onto Celite and purified by silica gel chromatography using 1-10% MeOH (containing 0.2% NH3)/CH2Cl2 to obtain 2-[(2-{[1-(N,N-dimethylglycyl)-5-(methyloxy)-2,3-dihydro-1H-indol-6-yl]amino}-5-fluoro-1H-pyrrolo[2,3-d]pyrimidin-4-yl)amino]-6-fluoro-N-methylbenzamide as a brown solid (44 mg, 55%). 1H NMR (400 MHz, THF-d8) δ ppm 2.31 (s, 6H), 2.93 (d, J=4.58 Hz, 3H), 3.06 (t, J=8.24 Hz, 2H), 3.14 (s, 2H), 3.84 (s, 3H), 4.18 (t, J=8.33 Hz, 2H), 6.64 (s, 1H), 6.67-6.85 (m, 2H), 7.22-7.49 (m, 2H), 7.77 (br s, 1H), 8.75 (d, J=8.61 Hz, 1H), 9.35 (s, 1H), 10.50 (s, 1H), 10.76 (s, 1H); ESIMS (M+H)+=551.24.

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