Sodium Bicarbonate → 3-{1-[(2,5-difluorophenyl)acetyl]-2,3-dihydro-1H-indol-5-yl}-1-methyl-1H-pyrazolo[3,4-d]pyrimidin-4-amine

Participants

Reaction Steps

To a mixture of 5-bromo-1-[(2,5-difluorophenyl)acetyl]-2,3-dihydro-1H-indole (160 mg, 0.454 mmol), bis(pinacolato)diboron (127 mg, 0.500 mmol), and potassium acetate (134 mg, 1.363 mmol) was added 1,4-dioxane (6 mL), and the mixture was degassed with N2 for 10 minutes. PdCl2(dppf)-CH2Cl2 adduct (18.55 mg, 0.023 mmol) was added, and the reaction mixture was stirred for 3 hours at 100 C in a sealed vessel. The reaction was cooled down to room temperature. 3-bromo-1-methyl-1H-pyrazolo[3,4-d]pyrimidin-4-amine (104 mg, 0.454 mmol) and sat. aq. NaHCO3 (2 mL) were added, and N2 gas was bubbled through the mixture for 10 minutes. PdCl2(dppf)-CH2Cl2 adduct (18.55 mg, 0.023 mmol) was added, the vessel was sealed, and the reaction mixture was stirred overnight at 100 C (LCMS:N13207-34suzu). The mixture was allowed to cool to room temperature and poured onto water (˜150 mL). The resulting mixture was filtered, and the resulting solid was triturated with Et2O. To the solid in the filter was added a 90:10 mixture of CHCl3:CH3OH (˜7 mL), and the resulting mixture was filtered. The filtrate was injected into a 90 g SiO2 columns. Flash chromatography on SiO2 (gradient: 100% CHCl3 to 90:10:1 CHCl3:CH3OH:NH4OH) provided the title compound 3-{1-[(2,5-difluorophenyl)acetyl]-2,3-dihydro-1H-indol-5-yl}-1-methyl-1H-pyrazolo[3,4-d]pyrimidin-4-amine (160 mg) as a brown solid. 1H NMR (400 MHz, DMSO-d6) δ 3.29 (t, J=8.34 Hz, 2H), 3.94 (s, 3H), 3.97 (s, 2H), 4.30 (t, J=8.46 Hz, 2H), 7.14-7.31 (m, 3H), 7.44 (d, J=8.34 Hz, 1H), 7.53 (s, 1H), 8.14 (d, J=8.34 Hz, 1H), 8.25 (s, 1H)

Provenance & Evidence