反应详情

温度

-78 °C

n-Butyllithium (0.97 mL, 1.55 mmol) was added dropwise over 20 min to a cooled (−78° C.) solution of N-[3-(4-bromophenyl)propyl]-N,N-dicyclobutylamine (0.10 g, 0.31 mmol) and triisopropyl borate (0.21 mL, 0.93 mmol) in anhydrous tetrahydrofuran (2 mL) under a nitrogen atmosphere. The reaction mixture was stirred for 2 h at −78° C. HCl (aq 3 M, 0.6 mL) was added to the reaction mixture and the mixture was allowed to warm to room temperature. Tetrahydrofuran (2 mL) was added, followed by sodium carbonate (1.1 g, 10.8 mmol), Pd(dppf)Cl2 (0.010 g, 12.2 μmol) and 3-amino-6-bromo-N-pyridin-3-ylpyrazine-2-carboxamide (0.10 g, 0.34 mmol). The mixture was heated to 65° C. for 15 h. The solvent was removed and purification by column chromatography on silica using a gradient methylene chloride to methylene chloride/methanol, (2:1), as the eluent gave a yellow solid. The solid was dissolved in methylene chloride (10 mL) and 1 M HCl in diethyl ether was added while stirring. The formed yellow precipitate was filtered and dried to give 75 mg (53% yield) of the title compound as yellow solid: 1H NMR (D2O, 400 MHz) δ 9.47 (s, 1H), 8.73 (s, 1H), 8.69 (d, J=8.6 Hz, 1H), 8.61 (d, J=5.6 Hz, 1H), 8.10 (dd, J=15, 6 Hz, 1H), 7.98 (d, J=9 Hz, 2H), 7.41 (d, J=9 Hz, 2H), 3.80 (m, 2H), 3.01 (m, 2H), 2.75 (m, 2H), 2.28 (m, 4H), 2.17 (m, 4H), 2.03 (m, 2H), 1.79 (m, 4H); MS (ESI) 457 m/z (M++1).

1. temperatureto warm to room temperature
2. temperatureThe mixture was heated to 65° C. for 15 h
3. customThe solvent was removed
4. custompurification by column chromatography on silica using a gradient methylene chloride to methylene chloride/methanol, (2:1), as the eluent
5. customgave a yellow solid
6. stirringwhile stirring
7. filtrationThe formed yellow precipitate was filtered
8. customdried