反应详情

To a stirred degassed suspension of a mixture of 2-amino-6-bromopyridine (5.38 g, 31.09 mmol), 2,4,6-(3-pyridinyl)-cyclotriboroxane (3.80 g, 12.07 mmol) and aqueous Na2CO3 (100 mL, 0.4M) in acetonitrile (100 mL) at room temperature Pd(PPh3)4 (1.70 g, 1.47 mmol) was added. The reaction mixture was heated at 95° for 1 to 2 days under nitrogen, cooled to the room temperature and filtered. The filtrate was concentrated purified by flash chromatography on silica gel (MeOH/CH2Cl2: 5/95→10/90 plus a few drops of NH4OH) and co-precipitated with a mixture of AcOEt/CH2Cl2/hexane to afford the title compound 11 (4.091 g, 23.90 mmol, 77% yield) as a pale yellow solid. 1H NMR (400 MHz, DMSO-d6) δ (ppm): 9.16 (dd, J=2.2, 0.8 Hz, 1H), 8.57 (dd, J=4.7, 1.6 Hz, 1H), 8.33-8.28 (m, 1H), 7.54-7.44 (m, 2H), 7.14 (dd, J=7.3, 0.5 Hz, 1H), 6.49 (dd, J=8.2, 0.4 Hz, 1H), 6.12 (bs, 2H).

1. customTo a stirred degassed
2. additionwas added
3. temperatureThe reaction mixture was heated at 95° for 1 to 2 days under nitrogen
4. filtrationfiltered
5. concentrationThe filtrate was concentrated
6. custompurified by flash chromatography on silica gel (MeOH/CH2Cl2: 5/95→10/90 plus a few drops of NH4OH) and co-precipitated with a mixture of AcOEt/CH2Cl2/hexane