反应详情

To a solution of 3.58 g (12.1 mmol) of 1-(4-aminophenyl)-4-methyl-7,8-methylenedioxy-3,4-dihydro-5H-2,3-benzodiazepine in 100 ml of chloroform first 1.68 ml (12.1 mmol) of triethylamine, then under constant ice-cooling and stirring 1.15 ml (12.1 mmol) of acetic anhydride were added. Stirring was continued for additional 2 hours, then the solution was extracted with 3×100 ml of water, the organic layer was dried and evaporated under reduced pressure. The crystalline residue was recrystallized from 40 ml of isopropanol to obtain 3.50 g (85.7%) of the aimed product, m.p. 220°-222° C. After repeated recrystallization the m.p. increased to 223°-225° C.

1. additionwere added
2. extractionthe solution was extracted with 3×100 ml of water
3. customthe organic layer was dried
4. customevaporated under reduced pressure
5. customThe crystalline residue was recrystallized from 40 ml of isopropanol