[H-].[Na+].[CH2:3]([O:5][C:6](=[O:15])[CH2:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][C:9]=1[OH:14])[CH3:4].[Cl:16][CH2:17][CH2:18]OS(C1C=CC=CC=1)(=O)=O>CN(C)C=O>[CH2:3]([O:5][C:6](=[O:15])[CH2:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][C:9]=1[O:14][CH2:18][CH2:17][Cl:16])[CH3:4]50% Sodium hydride in mineral oil (8.11 g, 169 mmol) was added portionwise to a solution of 2-hydroxy-phenyl-acetic acid ethyl ester (30.4 g, 169 mmol) in dimethylformamide (100 ml). After the initial effervescence had ended the reaction was heated to 100° C. for 10 minutes and was cooled to room temperature. A solution of benzene sulfonic acid 2-chloro-ethyl ester (37.2 g, 169 mmol) in dimethylformamide (5 ml) was then added and the reaction was heated to 100° C. for one hour, and allowed to cool to room temperature over 18 hours. The reaction mixture was partitioned between diethylether (300 ml) and water (300 ml) and the organic phase was removed and washed with water (100 ml), dried over MgSO4 and the solvent was removed under reduced pressure. The residue was purified by thermal distillation to give [2-(2-chloro-ethoxy)-phenyl]-acetic acid ethyl ester (22.0 g) as a pale yellow oil. Bp 170° C. to 180° C. νmax (thin film) 1735 cm−1 (C═O, ester); no O—H stretch. Anal. Found C, 59.35; H, 6.29. C12H15CIO3 requires C, 59.38; H, 6.23%.
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