反应详情

温度

60 °C

Acetic anhydride (2.24 g) was added to a solution of 8,9-dihydro-7-[(hydroxy)(2-methylpyridin-3-yl)methyl]-10-methylpyrido[1,2-a]indol-6(7H)-one (1.35 g, a mixture of the isomers A and B) in pyridine (20 ml). After being stirred at 60° C. for 2 hours, the solution was evaporated in vacuo. The residue was diluted with chloroform, washed with brine, dried over anhydrous magnesium sulfate, and evaporated in vacuo. The residue and 1,8-diazabicyclo[5.4.0]undec-7-ene (1.27 g) were dissolved in toluene (30 ml). The solution was stirred at 60° C. for 2 hours and evaporated in vacuo. The residue was crystallized from ethyl acetate to give 8,9-dihydro-10-methyl-7-[(2-methylpyridin-3-yl)methylene]pyrido[1,2-a]-indol-6(7H)-one (0.92 g).

1. customthe solution was evaporated in vacuo
2. additionThe residue was diluted with chloroform
3. washwashed with brine
4. dry with materialdried over anhydrous magnesium sulfate
5. customevaporated in vacuo
6. dissolutionThe residue and 1,8-diazabicyclo[5.4.0]undec-7-ene (1.27 g) were dissolved in toluene (30 ml)
7. stirringThe solution was stirred at 60° C. for 2 hours
8. customevaporated in vacuo
9. customThe residue was crystallized from ethyl acetate