[CH3:1][O:2][C:3]1[CH:11]=[CH:10][C:6]([C:7]([NH2:9])=[O:8])=[CH:5][CH:4]=1.C(Cl)(=O)[C:13](Cl)=[O:14]>ClCCl>[CH3:1][O:2][C:3]1[CH:11]=[CH:10][C:6]([C:7]([N:9]=[C:13]=[O:14])=[O:8])=[CH:5][CH:4]=1To 4-methoxybenzamide (2.6 mmol) in dichloromethane (10 mL) was added oxalyl chloride 98% (6.61 mmol) dropwise. The mixture was heated to reflux for 20 h. Reaction completion monitored by TLC. The solvent was removed in vacuo (40° C., 760 mmHg) to obtain title compound D11, which was immediately used without purification.
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