反应详情

To a solution of 5-methylpyridin-2-amine (191 mg, 1.76 mmol) in DCE at 0° C. was added Al(CH3)2Cl drop-wise. After stirring the mixture at room temperature for 20 minutes ethyl 4-({6-[(dimethylamino)carbonyl]pyridin-3-yl}oxy)-2-methyl-1-benzofuran-6-carboxylate (65 mg, 0.18 mmol) was added. The reaction was stirred at room temperature for 14 hours. The sample was diluted with CH2Cl2 and quenched with potassium sodium tartrate tetrahydrate (20% w/w) (1 mL). Caution, addition was done slowly. The organic layer was washed with brine, dried over Na2SO4 and concentrated. The crude sample was introduced into a silica gel column and eluted with MeOH/CHCl3 (3/97) to provide the product (35 mg, 85% yield) as white solid. 1H NMR (300 MHz, CHLOROFORM-d) δ ppm 2.32 (s, 3 H) 2.48 (s, 3 H) 3.16 (d, J=7.54 Hz, 6 H) 6.26 (s, 1 H) 7.31 (dd, J=8.67, 2.83 Hz, 1 H) 7.48 (d, J=1.13 Hz, 1 H) 7.58 (d, J=6.78 Hz, 1 H) 7.69 (d, J=8.67 Hz, 1 H) 7.87 (s, 1 H) 8.12 (s, 1 H) 8.26 (d, J=8.48 Hz, 1 H) 8.38 (d, J=2.64 Hz, 1 H) 8.53 (s, 1 H); MS (ESI, pos): 431.

1. additionwas added
2. customquenched with potassium sodium tartrate tetrahydrate (20% w/w) (1 mL)
3. additionCaution, addition
4. washThe organic layer was washed with brine
5. dry with materialdried over Na2SO4
6. concentrationconcentrated
7. additionThe crude sample was introduced into a silica gel column
8. washeluted with MeOH/CHCl3 (3/97)