[O-]CC.[Na+].[CH2:5]([O:7][C:8](=[O:14])[C:9](OCC)=[O:10])[CH3:6].[CH2:15]([O:17][C:18](=[O:29])[CH2:19][O:20][C:21]1[CH:26]=[CH:25][CH:24]=[C:23]([O:27][CH3:28])[CH:22]=1)[CH3:16].Cl>C(OCC)C>[CH2:15]([O:17][C:18](=[O:29])[CH:19]([O:20][C:21]1[CH:26]=[CH:25][CH:24]=[C:23]([O:27][CH3:28])[CH:22]=1)[C:9](=[O:10])[C:8]([O:7][CH2:5][CH3:6])=[O:14])[CH3:16]Sodium ethoxide (32.5 g, 454 mmol) is covered with 1 l of dry diethyl ether. Oxalic acid diethyl ester (55.2 ml, 416 mmol) is added drop wise within 20 min. After 30 min stirring at room temperature, the mixture is heated to reflux. A solution of (3-methoxy-phenoxy)-acetic acid ethyl ester (22) (79.5 g, 378 mmol) in 80 ml of dry diethyl ether is added drop wise within 30 min and the mixture is allowed to reflux for 1 hour. After cooling down to room temperature, the reaction mixture is poured on 2M HCl (400 ml)/ice (400 g) and extracted with diethyl ether. The organic layers are dried over sodium sulfate, filtrated and evaporated.
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