Cl.[CH2:2]([N:4]1[CH2:8][CH2:7][CH2:6][CH:5]1[CH2:9][NH:10][C:11](=[O:22])[C:12]1[C:17]([O:18]C)=[CH:16][CH:15]=[CH:14][C:13]=1[O:20][CH3:21])[CH3:3].B(Br)(Br)[Br:24].O>ClCCl>[CH2:2]([N:4]1[CH2:8][CH2:7][CH2:6][CH:5]1[CH2:9][NH:10][C:11](=[O:22])[C:12]1[C:17]([OH:18])=[CH:16][CH:15]=[C:14]([Br:24])[C:13]=1[O:20][CH3:21])[CH3:3]To a solution of N-ethyl-2-(2,6-dimethoxybenzamidomethyl)pyrrolidine hydrochloride (23.0 g, 0.07 mole) in 300 ml of dry dichloromethane was added dropwise with stirring a solution of boron tribromide (17.5 g, 0.07 mole) in 25 ml of dry dichloromethane at 0° C. After the addition was completed the solution was allowed to reach room temperature over night. Water was added and pH adjusted to 7. The organic layer was washed with water and dried (MgSO4). The solvent was evaporated in vacuo affording the title compound as a viscous oil (20 g) which was judged by TLC and GC analysis to be sufficiently pure for use in the next step without further purification.
Wird geladen…
