Azobisisobutyronitrile → tert-Butyl(2S)-[4-(bromomethyl)phenyl](cyclopentyl)acetate

反応式

[CH:1]1([C@@H:6]([C:14]2[CH:19]=[CH:18][C:17]([CH3:20])=[CH:16][CH:15]=2)[C:7]([O:9][C:10]([CH3:13])([CH3:12])[CH3:11])=[O:8])[CH2:5][CH2:4][CH2:3][CH2:2]1.N(C(C)(C)C#N)=NC(C)(C)C#N.[Br:33]N1C(=O)CCC1=O>C(Cl)(Cl)Cl>[Br:33][CH2:20][C:17]1[CH:18]=[CH:19][C:14]([C@H:6]([CH:1]2[CH2:5][CH2:4][CH2:3][CH2:2]2)[C:7]([O:9][C:10]([CH3:12])([CH3:11])[CH3:13])=[O:8])=[CH:15][CH:16]=1

参加物

実験手順

3.0 g (10.93 mmol) of tert-butyl(2S)-cyclopentyl-(4-methylphenyl)acetate were heated to reflux in 20 ml of chloroform, and 90 mg (0.55 mmol) of 2,2′-azobis(2-methylpropanenitrile) and 2.72 g (15.31 mmol) of N-bromosuccinimide were then added in 5 portions every 30 min. The mixture was stirred under reflux for 6 h and then cooled to RT and concentrated on a rotary evaporator. The residue was purified by chromatography on 120 ml of silica gel (mobile phase cyclohexane/ethyl acetate 4:1). This gave 2.8 g (72% of theory) of the title compound.