Cesium carbonate → N-(3-chloro-4-fluorophenyl)-7-(piperidin-1-ylmethyl)-2-(pyridin-3-yl)quinazolin-4-amine

Participants

Reaction Conditions

Reaction Steps

A dry 15 mL sealed tube was charged with 7-bromo-N-(3-chloro-4-fluorophenyl)-2-(pyridin-3-yl)quinazolin-4-amine (synthesized as described in Scheme 1 and 4, substituting 4-bromo-2-nitrobenzoic acid for 2-nitro-5-propoxy-benzoic acid and 3-chloro-4-fluoroaniline for 2-aminobenzamide) (100 mg, 0.233 mmol), potassium 1-trifluoroboratomethylpiperidine (52.5 mg, 0.256 mmol), cesium carbonate (227.5 mg, 0.698 mmol), Pd(OAc)2 (1.6 mg, 3 mol %) and XPhos (6.7 mmol, 6 mol %) in THF/water (10:1, 3.3 mL). The reaction mixture was stirred at 80° C. for 16 hours. The reaction mixture was filtered through a pad of Celite and solvent was removed in vacuo. The crude product was purified by ISCO (silica, 12 g column, 97% dichloromethane-3% methanol-0.1% NH4OH) to yield the desired compound as a yellow solid (23.3 mg, 22%). LCMS m/z=448.0 (M+1) (Method C) (retention time=1.95 min). 1H NMR (300 MHz, CD3OD) δ 9.40 (d, J=1.4 Hz, 1H), 8.70-8.62 (m, 1H), 8.56 (dd, J=4.9, 1.6 Hz, 1H), 8.18-8.09 (m, 2H), 7.69 (ddd, J=6.8, 4.1, 2.1 Hz, 2H), 7.54-7.45 (m, 2H), 7.23 (t, J=9.0 Hz, 1H), 3.61 (s, 2H), 2.47 (s, 4H), 1.64 (dd, J=13.9, 8.9 Hz, 5H), 1.49 (d, J=4.1 Hz, 2H).

Provenance & Evidence