[CH3:1][O:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][C:4]=1[CH2:9][C:10]([O:12][CH2:13][CH3:14])=[O:11].[CH3:15][C:16](C)([O-:18])C.[Na+].C(OCC)(=O)C.Cl>C(OC(C)C)(C)C>[CH3:1][O:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][C:4]=1[CH:9]([C:16]([CH3:15])=[O:18])[C:10]([O:12][CH2:13][CH3:14])=[O:11]A mixture of ethyl 2-methoxyphenyiacetate (11.6 g), sodium tert-butoxide (12.7 g) and ethyl acetate (15.8 g) in diisopropylether was heated at 70° C. for 2.5 hours and stirred at room temperature overnight. Ethyl acetate and hydrochloric acid (2M) were added and the organic phase dried (magnesium sulphate) and evaporated. The residue was distilled in vacuo to give ethyl 2-(2-methoxyphenyl)acetoacetate as a liquid (8.5 g), NMR 1.15 and 1.13(t,3h), 1.8 and 2.2(s,3H), 3.75 and 3.85(s,3H), 4.1-4.3(2q,2H), 5.15(s,1H), 6.9-7.3(m,4H), 13.1(s,1H).
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