反应详情

2-Amino-5-methylpyridine (289 mg, 2.67 mmol) was dissolved in DCE (10 mL) at 0° C., then Al(CH3)2Cl (2.67 mL, 1M in hexanes) was added drop wise. After the addition, the ice-bath was removed, and the mixture was stirred for 30 min at room temperature. Ethyl 2-methyl-4-[4-(methylsulfonyl)phenoxy]-1-benzofuran-6-carboxylate (100 mg, 0.267 mmol) was added and the stirring was continued for 14 h. The reaction was quenched with potassium sodium tartrate tetrahydrate (20% w/w) cautiously. The product was extracted with CHCl3, washed with brine and dried over MgSO4. The crude product was purified by gradient silica gel chromatography using CHCl3/MeOH (100/0 to 98/2) to give the title compound (100 mg, 86%) as a white solid. 1H NMR (300 MHz, CHLOROFORM-D) δ ppm 2.32 (s, 3 H) 2.48 (s, 3 H) 3.07 (s, 3 H) 6.24 (s, 1 H) 7.08-7.16 (m, 2 H) 7.48 (d, J=1.32 Hz, 1 H) 7.57 (dd, J=8.29, 2.35 Hz, 1 H) 7.81-7.97 (m, 3 H) 8.12 (d, J=2.35 Hz, 1 H) 8.25 (d, J=8.29 Hz, 1 H) 8.44 (s, 1 H). LCMS for C23H20N2O5S m/z 437.4 (M+H)+.

1. additionAfter the addition
2. customthe ice-bath was removed
3. waitthe stirring was continued for 14 h
4. customThe reaction was quenched with potassium sodium tartrate tetrahydrate (20% w/w) cautiously
5. extractionThe product was extracted with CHCl3
6. washwashed with brine
7. dry with materialdried over MgSO4
8. customThe crude product was purified by gradient silica gel chromatography