反应详情

To a solution of 2-(4-bromo-3-[1,3]dioxolan-2-yl-phenoxy)-6-(2-methoxy-ethylamino)-nicotinonitrile (8) (1.0 g, 2.38 mmol) in THF (50 mL) was added HCl solution (1M/H2O, 20 mL). After overnight, the THF was evaporated under vacuum. The aqueous solution was extracted with EtOAc (2×50 mL). The organic layer was washed with water (3×50 mL), dried over MgSO4, filtered and evaporated in vacuo. Purification was accomplished by silica gel chromatography, eluting with 25%-100% EtOAc/hexanes gradient, to afford the desired product 780 mg (87% yield) as a white solid. 1H NMR (400 MHz, chloroform-d) δ ppm 10.34 (s, 1 H), 7.80 (d, J=2.7 Hz, 1 H), 7.67 (d, J=8.6 Hz, 1 H), 7.60 (d, J=8.2 Hz, 1 H), 7.30 (dd, J=8.8, 2.9 Hz, 1 H), 6.13 (d, J=8.2 Hz, 1 H), 5.24 (br. s., 1 H), 3.42 (t, J=4.9 Hz, 2 H), 3.35-3.27 (m, 5 H).

1. customthe THF was evaporated under vacuum
2. extractionThe aqueous solution was extracted with EtOAc (2×50 mL)
3. washThe organic layer was washed with water (3×50 mL)
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. customevaporated in vacuo
7. customPurification
8. washeluting with 25%-100% EtOAc/hexanes gradient