反应详情

Triphosgene (1.8 g) was added to a solution of tert-butyl 3-aminobenzoate (3.13 g) in anhydrous tetrahydrofuran (200 ml) under ice-cooling, and then triethylamine (7.25 ml) was added five times each 1.45 ml over 15 minutes, and the mixture was stirred at room temperature for 5 minutes. Subsequently (R)-(−)-2-oxo-3-amino-5-cyclohexyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine (4 g) was added under ice-cooling. The mixture was stirred at room temperature for one hour, the reaction mixture was concentrated under reduced pressure. Ice-water was added to the residue, extracted with methylene chloride,the organic layer was washed with saturated brine. After dried over anhydrous sodium sulfate, the solvent was evaporated under reduced pressure. Diisopropyl ether was added to the residue, crystals were collected by filtration, to thereby obtain 7.38 g of the titled compound.

1. temperaturecooling
2. temperaturecooling
3. stirringThe mixture was stirred at room temperature for one hour
4. concentrationthe reaction mixture was concentrated under reduced pressure
5. additionIce-water was added to the residue
6. extractionextracted with methylene chloride,the organic layer
7. washwas washed with saturated brine
8. dry with materialAfter dried over anhydrous sodium sulfate
9. customthe solvent was evaporated under reduced pressure
10. additionDiisopropyl ether was added to the residue, crystals
11. filtrationwere collected by filtration