1,8-Diazabicyclo(5.4.0)undec-7-ene → HCID 18001111, Verbindung

Temperatur

80 °C

Ethyl 4-formyl-3-nitrobenzoate (5.81 g) was dissolved in 70 ml of toluene, then 2.1 ml of 1,8-diazabicyclo[5.4.0]-undec-7-ene and the mixture was stirred at 80° C. for one hour. To the reaction solution, 2.69 g of 3-[(1,1,1-triphenylphosphonio)methyl]benzonitrile bromide was added, and the mixture was stirred at 80° C. for 24 hours. Insoluble matters were filtered out and the filtrate was concentrated in vacuo. The resulting residue was purified by silica gel column chromatography using hexane-ethyl acetate (10:1) as an eluting solvent. The resulting intermediate (3.1 g) was dissolved in a mixed solvent of 50 ml of ethanol and 10 ml of tetrahydrofuran, then 1 g of a palladium oxide-barium sulfate complex was added and the mixture was stirred in a hydrogen atmosphere at room temperature for 3 days. The reaction solution was filtered through Celite and the filtrate was concentrated in vacuo. The resulting residue was purified by silica gel column chromatography using hexane-ethyl acetate (2:1) as an eluting solvent to give 2.35 g of ethyl 3-amino-4-[2-(3-cyanophenyl)ethyl]benzoate.

1. filtrationInsoluble matters were filtered out
2. concentrationthe filtrate was concentrated in vacuo
3. customThe resulting residue was purified by silica gel column chromatography
4. dissolutionThe resulting intermediate (3.1 g) was dissolved in a mixed solvent of 50 ml of ethanol and 10 ml of tetrahydrofuran
5. addition1 g of a palladium oxide-barium sulfate complex was added
6. stirringthe mixture was stirred in a hydrogen atmosphere at room temperature for 3 days
7. filtrationThe reaction solution was filtered through Celite
8. concentrationthe filtrate was concentrated in vacuo
9. customThe resulting residue was purified by silica gel column chromatography

ORD-Eintrag

ord-b31f77fc53c9453585b6d15f3bcbf7a8

Quelldatensatz

uspto-grants-2007_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07307074B2