[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH2:13][C:14]([OH:16])=O)[CH:6]=[C:7]([O:11][CH3:12])[C:8]=1[O:9][CH3:10].C(Cl)(=O)C([Cl:20])=O>CN(C)C=O.ClCCl>[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH2:13][C:14]([Cl:20])=[O:16])[CH:6]=[C:7]([O:11][CH3:12])[C:8]=1[O:9][CH3:10]Combine 3,4,5-trimethoxy-phenyl-acetic acid (2.26 g, 10 mmol) and dichloromethane (50 mL). Cool to -5° C. using a ice-salt bath. Add 2 drops of dimethylformamide followed by dropwise addition of oxalyl chloride (1.74 mL, 20 mmol). after 1 hour, warm the reaction mixture to ambient temperature. After 2 hours, evaporate the reaction mixture in vacuo to give the title compound as a liquid.
Wird geladen…