Allyl bromide → Methyl 4-(3-bromopropyl)benzoate
Reaction equation
[CH3:1][O:2][C:3](=[O:14])[C:4]1[CH:9]=[CH:8][C:7]([CH2:10][CH2:11][CH2:12]O)=[CH:6][CH:5]=1.C(N1C=CN=C1)(N1C=CN=C1)=O.C([Br:30])C=C>CC#N>[CH3:1][O:2][C:3](=[O:14])[C:4]1[CH:9]=[CH:8][C:7]([CH2:10][CH2:11][CH2:12][Br:30])=[CH:6][CH:5]=1Participants
5
Reactant 3
Product 1
Reagents, catalysts & solvents 1
Procedure
A solution of 4-(3-hydroxy-propyl)-benzoic acid methyl ester (11.98 g) and 1,1′-carbonyldiimidazole (9.0 g, 55.50 mmol) in CH3CN (200 mL) was stirred at room temperature for 1.5 h. Allyl bromide (20 mL) was added and the reaction mixture was heated under reflux for 20 h. The reaction mixture was cooled to room temperature and saturated aqueous NaHCO3was added. The aqueous solution was washed with EtOAc (3×) and the organic solutions were combined, dried (MgSO4), filtered and concentrated. Purification by medium pressure chromatography (9:1 hexanes:EtOAc) provided the title compound of Preparation 4.