反应步骤
To a suspension of (R)-1-[5-(2,2,2-trifluoroethoxy)pyridin-2-yl]ethylamine bis-HCl (0.75 g, 2.6 mmol), 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenylacetic acid (0.67 g, 2.6 mmol), EDC (0.59 g, 3.1 mmol), and 1-hydroxy-7-azabenzotriazole (0.42 g, 3.1 mmol) in DMF (5 mL) was added diisopropylethylamine (1.8 mL, 10.2 mmol). After stirring for 90 min at room temperature, the reaction mixture was loaded directly onto a silica gel column and purified by normal phase chromatography (20-80% EtOAc/hexanes) to give 2-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)]-N-{(1R)-1-[5-(2,2,2-trifluoroethoxy)pyridin-2-yl]ethyl}acetamide (0.77 g, 65%) as a viscous oil that slowly solidified to a white solid. MS (Electrospray): m/z 465.1 (M+H). To a microwave vial containing 2-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)]-N-{(1R)-1-[5-(2,2,2-trifluoroethoxy)pyridin-2-yl]ethyl}acetamide (50 mg, 0.11 mmol), 8-bromoquinazoline (25 mg, 0.12 mmol), and bis(triphenylphosphine)palladium(II) chloride (10 mg, 0.01 mmol) in acetonitrile (1 mL) was added aqueous 1M sodium carbonate (1 mL, 1.0 mmol) and the mixture was heated in a microwave at 150° C. for 10 min. The top organic layer was removed, loaded onto a silica gel column and purified by normal phase chromatography (30-100% EtOAc/hexanes) to give 2-(4-quinazolin-8-ylphenyl)-N-{(1R)-1-[5-(2,2,2-trifluoroethoxy)pyridin-2-yl]ethyl}acetamide (21 mg, 38%) as a white solid. 1H NMR (400 MHz, CDCl3) δ 9.46 (s, 1H), 9.37 (s, 1H), 8.25 (d, J=2.4 Hz, 1H), 7.96 (m, 2H), 7.75 (m, 1H), 7.69 (d, J=8.2 Hz, 2H), 7.44 (d, J=8.2 Hz, 2H), 7.22 (m, 2H), 6.79 (d, J=7.2 Hz, 1H), 5.16 (m, 1H), 4.37 (q, J=8.0 Hz, 2H), 3.68 (s, 2H), 1.44 (d, J=6.8 Hz, 3H); MS (Electrospray): m/z 467.1 (M+H). FLIPR alpha1I IP=19 nM.
