反应详情

Methylmagnesium bromide (3M/ether, 0.25 mL, 0.75 mmol, 3.0 eq.) was added to a stirred solution of 1-(3-((4-(1,3-dioxolan-2-yl)-6-methoxypyridin-3-yloxy)methyl)pyridin-2-yl)propan-1-one (82 mg, 0.25 mmol, 1 eq.) in THF (5.0 mL) at −78° C. After addition, the reaction mixture was warm to rt and quenched with aqueous citric acid solution. The aqueous layer was extracted with EtOAc (20 mL) twice. The combined organic layers were washed with NaHCO3(sat) solution and brine, dried over Na2SO4, concentrated, and purified on silica gel using a mixture of EtOAc and hexanes as eluent to give 2-(3-((4-(1,3-dioxolan-2-yl)-6-methoxypyridin-3-yloxy)methyl)pyridin-2-yl)propan-2-ol (38 mg, 44%) as a colorless oil. 1H NMR (400 MHz, CDCl3) δ 8.43 (dd, J=7.7, 1.6 Hz, 1H), 7.84 (dd, J=7.7, 1.5 Hz, 1H), 7.74 (s, 1H), 7.18 (dd, J=7.7, 4.7 Hz, 1H), 6.84 (s, 1H), 6.01 (s, 1H), 5.27 (s, 2H), 4.07-3.88 (m, 4H), 3.82 (s, 3H), 1.55 (s, 6H). LRMS (M+H+) m/z 347.1.

1. additionAfter addition
2. customquenched with aqueous citric acid solution
3. extractionThe aqueous layer was extracted with EtOAc (20 mL) twice
4. washThe combined organic layers were washed with NaHCO3(sat) solution and brine
5. dry with materialdried over Na2SO4
6. concentrationconcentrated
7. custompurified on silica gel using
8. additiona mixture of EtOAc and hexanes as eluent