[Cl:1][C:2]1[CH:3]=[C:4]([CH:8]=[C:9]([Cl:13])[C:10]=1[O:11][CH3:12])[C:5](O)=[O:6].C1(C)C=CC=CC=1.S(Cl)([Cl:23])=O>CN(C)C=O>[Cl:1][C:2]1[CH:3]=[C:4]([CH:8]=[C:9]([Cl:13])[C:10]=1[O:11][CH3:12])[C:5]([Cl:23])=[O:6]To 3,5-dichloro-4-methoxybenzoic acid (8.81 g), toluene (170 mL), N,N-dimethylformamide (5 droplets) and thionyl chloride (6.0 mL) were added, and then the mixture was stirred at 60° C. for 16 hours. The solvent was distilled off under reduced pressure and the obtained residue was azeotroped with toluene and then used for the synthesis of (c).
Wird geladen…