[CH3:1][O:2][C:3]1[CH:12]=[CH:11][C:10]([C:13](=[O:15])[CH3:14])=[CH:9][C:4]=1[C:5]([O:7]C)=[O:6].Cl>C(O)(=O)C>[CH3:1][O:2][C:3]1[CH:12]=[CH:11][C:10]([C:13](=[O:15])[CH3:14])=[CH:9][C:4]=1[C:5]([OH:7])=[O:6]Methyl 2-methoxy-5-acetylbenzoate (Step A, 3 g, 14.4 mmol) was dissolved in acetic acid (80 ml) and then treated with c HCl (28 ml). The reaction mixture was refluxed for 4 hours, concentrated under reduced pressure and lyophilized to provide the title compound as cream color solid, which was used without further purification.
Wird geladen…