Cesium carbonate → 6-[4-(6-Amino-pyridin-3-yl)-phenyl]-5-(4-chloro-phenyl)-1-phenyl-1,5-dihydro-pyrazolo[3,4-d]pyrimidin-4-one

Participants

Reaction Conditions

Reaction Steps

A reaction tube charged with 5-(4-chloro-phenyl)-1-phenyl-6-[4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-1,5-dihydro-pyrazolo[3,4-d]pyrimidin-4-one (500.0 mg, 0.953 mmol), 2-amino-5-bromopyridine (247.3 mg, 1.43 mmol), Cs2CO3 (620.8 mg, 1.91 mmol), and Pd(dppf)2Cl2 (38.9 mg, 0.048 mmol) is purged with nitrogen. Anhydrous DMF (9.5 mL) is added via syringe. The reaction mixture is heated at 100° C. for overnight, cooled down to room temperature, then taken in H2O (100 mL) and ethyl acetate (50 mL). The insoluble solid is filtered off and the two layers of the filtrate are separated. The aqueous layer is extracted with ethyl acetate (2×50 mL). The combined organic phase is washed with brine, dried over MgSO4, concentrated, and purified by reverse phase HPLC to provide 6-[4-(6-amino-pyridin-3-yl)-phenyl]-5-(4-chloro-phenyl)-1-phenyl-1,5-dihydro-pyrazolo[3,4-d]pyrimidin-4-one (244.2 mg, 52% yield) as a light yellow solid product; 1H NMR (CDCl3, 400 MHz) δ 8.33 (s, 1H), 8.28 (d, 1H), 8.16 (d, 2H), 7.66 (dd, 1H), 7.51 (t, 2H), 7.40 (m, 4H), 7.35 (m, 3H), 7.13 (d, 2H), 6.59 (d, 1H), 4.72 (br, 2H); HPLC-MS calculated for C28H19ClN6O (M+H+) 491.1. Found 491.1.

Provenance & Evidence