[C:1]1([C:11](=[O:16])[CH2:12][C:13](=[O:15])[CH3:14])[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[CH:3][CH:2]=1.[C:17](OCC)(=[O:23])[C:18]([O:20][CH2:21][CH3:22])=[O:19].[H-].[Na+].Cl>COCCOC.O>[C:1]1([C:11](=[O:16])[CH2:12][C:13](=[O:15])[CH2:14][C:17](=[O:23])[C:18]([O:20][CH2:21][CH3:22])=[O:19])[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[CH:3][CH:2]=1A solution of 1-(1-naphthalenyl)-1,3-butanedione (5.3 g) and diethyl oxalate (6.75 ml) in 1,2-dimethoxyethane (10 ml) was added dropwise to a stirred suspension of sodium hydride (3.6 g, 50% dispersion in mineral oil, washed with petrol 40°-60° C.) in 1,2-dimethoxyethane (40 ml) under nitrogen. The stirred mixture was heated under reflux for 5 minutes, cooled, acidified with 2 M hydrochloric acid (50 ml), diluted with water (50 ml) and filtered. The filtrate was extracted with ethyl acetate and the extract was dried and evaporated to yield ethyl 6-(1-naphthalenyl)-2,4,6-trioxohexanoate as a dark oil.
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