Sodium Hydroxide → 4-[1-(4-Bromo-phenoxyl)-heptyl]-benzoic acid
Reaktionsgleichung
C[O:2][C:3](=[O:25])[C:4]1[CH:9]=[CH:8][C:7]([CH:10]([O:17][C:18]2[CH:23]=[CH:22][C:21]([Br:24])=[CH:20][CH:19]=2)[CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][CH3:16])=[CH:6][CH:5]=1.[OH-].[Na+]>C(O)C>[Br:24][C:21]1[CH:20]=[CH:19][C:18]([O:17][CH:10]([C:7]2[CH:6]=[CH:5][C:4]([C:3]([OH:25])=[O:2])=[CH:9][CH:8]=2)[CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][CH3:16])=[CH:23][CH:22]=1Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
To a solution of 4-(1-hydroxy-heptyl)-benzoic acid methyl ester (1800 mg, 7.2 mmol) in toluene (72 mL) is added 1,1′-(azodicarbonyl)dipiperidine (ADDP, 2725 mg, 10.8 mmol) at 0° C., followed by the additions of tributylphosphine (2.69 mL, 10.8 mmol) and 4-bromo-phenol (1503 mg, 8.64 mmol). The reaction mixture is warmed up to room temperature and stirred overnight. The mixture is loaded on silica gel, eluted with hexanes with a gradient from 0% of ethyl acetate to 50% of ethyl acetate giving 4-[1-(4-bromo-phenoxyl)-heptyl]-benzoic acid methyl ester. 1900 mg of the ester product is taken into ethanol (5 mL), treated with sodium hydroxide (5N aqueous, 2 mL) for 3 h at room temperature. The mixture is concentrated, diluted with ethyl acetate, acidified with 5 N HCl (2 mL), and extracted with ethyl acetate. The organic layers are dried and concentrated giving 4-[1-(4-bromo-phenoxyl)-heptyl]-benzoic acid (1800 mg).