反应详情

To a solution of 7-amino-2-[5-(dimethoxymethyl)-4,5-dihydro-1,3-thiazol-2-yl]-1H-indol-5-yl pivalate (2.55 g) in pyridine (50 mL) was added dropwise a pyridine solution (10 mL) of pyridine-2-sulfonyl chloride (1.27 g) under ice-cooling, and the mixture was stirred at room temperature for 30 min. The reaction solution was diluted with ethyl acetate and diethyl ether, washed with water and saturated brine, dried (MgSO4), and concentrated. The residue was dissolved in N,N-dimethylformamide (50 mL), and potassium carbonate (1.1 g) and methyl iodide (0.45 mL) were added under ice-cooling. The mixture was stirred at room temperature for 30 min, diluted with ethyl acetate, washed with water and saturated brine, dried (MgSO4), and concentrated under reduced pressure. The residue was purified by basic silica gel column chromatography (hexane:ethyl acetate=95:5-4:6) to give the title compound (3.1 g, yield 87%) as a pale-yellow amorphous powder.

1. temperaturecooling
2. washwashed with water and saturated brine
3. dry with materialdried (MgSO4)
4. concentrationconcentrated
5. dissolutionThe residue was dissolved in N,N-dimethylformamide (50 mL)
6. additionpotassium carbonate (1.1 g) and methyl iodide (0.45 mL) were added under ice-
7. temperaturecooling
8. stirringThe mixture was stirred at room temperature for 30 min
9. additiondiluted with ethyl acetate
10. washwashed with water and saturated brine
11. dry with materialdried (MgSO4)
12. concentrationconcentrated under reduced pressure
13. customThe residue was purified by basic silica gel column chromatography (hexane:ethyl acetate=95:5-4:6)