反应详情

A solution of 4-methoxypyridin-2-amine (100 mg, 0.806 mmol) in DCM (1.6 mL) under N2 atmosphere was cooled in an dry ice/IPA bath, and tribromoborane (0.305 mL, 3.23 mmol) was added with a syringe. After removing the cold bath, the reaction was stirred overnight at room temperature. The reaction mixture was diluted with water (5 mL) and stirred for an additional 30 min. It was then washed with saturated NaHCO3 (20 mL) to pH=7 and extracted with DCM (3×20 mL). The combined organic layer was dried over MgSO4 and concentrated to provide 2-aminopyridin-4-ol. The title compound was prepared in a manner similar to that described in Method EE using Intermediate 1 (see Example 1.1) and 2-aminopyridin-4-ol. LCMS m/z=369.3 [M+H]+; 1H NMR: (400 MHz, CD3CN) δ ppm 0.50 (td, J=4.7 and 3.5 Hz, 1H), 1.22 (td, J=7.8 and 4.9 Hz, 1H), 2.21-2.26 (m, 1H), 2.31-2.38 (m, 1H), 2.93 (d, J=16.7 Hz, 1H), 3.05 (dd, J=16.6 and 6.3 Hz, 1H), 6.80 (dd, J=7.1 and 2.2 Hz, 1H), 6.95 (d, J=2.2 Hz, 1H), 7.15-7.21 (m, 1H), 7.22-7.29 (m, 1H), 7.52 (s, 1H), 7.70 (td, J=8.8 and 5.9 Hz, 1H), 7.82 (d, J=7.1 Hz, 1H).