Sodium hydride → Ethyl 5-chloro-4-hydroxy-1,1-dimethyl-2-oxo-naphthalene-3-carboxylate

Participants

Reaction Conditions

Reaction Steps

A solution of (E)-benzaldehyde oxime (234 mg, 1.93 mmol) in dry DMF (9 mL) was added to a suspension of NaH (46 mg, 1.93 mmol) in dioxane (9 mL) at room temperature. The mixture was stirred for 30 minutes and then cooled to 0° C. A solution of ethyl 3-(2-chloro-6-(1-ethoxy-2-methyl-1-oxopropan-2-yl)phenyl)propiolate (520 mg, 1.61 mmol) in dry DMF (9 mL) was added, and the mixture was stirred at 0° C. for 3 hours and then at room temperature for 1 hour. The mixture was quenched with water and then washed with EtOAc (2×). The aqueous layer was made acidic with 10% HCl and then extracted with EtOAc (2×). The extracts were dried over anhydrous MgSO4 and concentrated under vacuum. The residue was purified by flash chromatography to give 210 mg of ethyl 5-chloro-4-hydroxy-1,1-dimethyl-2-oxo-naphthalene-3-carboxylate as a colorless oil. MS m/e=295 (M+H)+.

Provenance & Evidence