[C:1]([C:4]1[CH:9]=[CH:8][C:7]([NH:10][C:11](=[O:13])[CH3:12])=[C:6]([Br:14])[CH:5]=1)(=[O:3])[CH3:2].[H-].[Na+].Br[CH2:18][C:19]([CH3:21])=[CH2:20]>CN(C=O)C>[C:1]([C:4]1[CH:9]=[CH:8][C:7]([N:10]([CH2:20][C:19]([CH3:21])=[CH2:18])[C:11](=[O:13])[CH3:12])=[C:6]([Br:14])[CH:5]=1)(=[O:3])[CH3:2]N-(4-Acetyl-2-bromophenyl)acetamide (25 g, 0.1 mole) in dry DMF (250 ml) was treated with sodium hydride (60%, 4.5 g, 0.11 mole) at 25° C. under argon with stirring for 1 h. 3-Bromo-2-methylpropene (1.1 ml, 0.11 mole) was added and the mixture stirred for a further 16 h. The mixture was concentrated in vacuo and partitioned between water and Et2O. The organic phase was dried and concentrated in vacuo to give the title compound (32.8 g, 100%).
Wird geladen…
