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

Participants

Reaction Steps

To a mixture of 5-bromo-1-[(2,5-difluorophenyl)acetyl]-2,3-dihydro-1H-indole (150 mg, 0.426 mmol), bis(pinacolato)diboron (114 mg, 0.447 mmol), and potassium acetate (125 mg, 1.278 mmol) was added 1,4-dioxane (6 mL), and the mixture was degassed with N2 for 10 minutes. PdCl2(dppf)-CH2Cl2 adduct (17.39 mg, 0.021 mmol) was added, and the reaction mixture was stirred for 3 hours at 100 C into a sealed vessel. The reaction was cooled down to room temperature. 5-bromothieno[2,3-d]pyrimidin-4-amine (103 mg, 0.447 mmol) and sat. aq. NaHCO3 (2 mL) were added, and N2 gas was bubbled through the mixture for 10 minutes. PdCl2(dppf)-CH2Cl2 adduct (17.39 mg, 0.021 mmol) was added, the vessel was sealed, and the reaction mixture was stirred overnight at 100 C. The mixture was poured onto water and a precipitate was formed. The mixture was filtered, and the solid was taken up into a mixture of 20% CH3OH/CH2Cl2 mixture, and the resulting mixture was filtered, injected into a 90 g silica gel column, and purified via flash chromatography (gradient: 100% Hexanes to 100% EtOAc). The fractions containing the product were combined and concentrated to afford a solid. Trituration with Et2O afforded 5-{1-[(2,5-difluorophenyl)acetyl]-2,3-dihydro-1H-indol-5-yl}thieno[2,3-d]pyrimidin-4-amine (120 mg) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 3.27 (t, 2H), 3.96 (s, 2H), 4.31 (t, J=8.46 Hz, 2H), 7.13-7.32 (m, 4H), 7.37 (s, 1H), 7.43 (s, 1H), 8.11 (d, J=8.08 Hz, 1H), 8.34 (s, 1H).

Provenance & Evidence