Hydrochloric Acid → 1-Naphthalenecarboxylic acid, 1,2,3,4-tetrahydro-2-oxo-, methyl ester

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Reaction Steps

To a suspension of sodium hydride (60% oil dispersion, 4.8 g gross) in dimethyl carbonate (150 mL) stirring at room temperature under argon, was added 2-oxo-1,2,3,4-tetrahydronaphthalene (14.6 g). The resulting mixture was then refluxed for 30 min before cooling to 0° C. Once at the prescribed temperature and while maintaining inert atmosphere, 2.0 M aqueous hydrochloric acid solution (200 mL) was added slowly. Upon completion of the addition, the reaction mixture was extracted with ethyl acetate (three times). The combined extracts were dried over anhydrous magnesium sulfate and evaporated under vacuum to yield a residue. The residue was purified by silica gel chromatography eluting with 15% ethyl acetate in hexane to obtain the title compound (16.9 g).

Provenance & Evidence