2,3-Dichloro-5,6-dicyano-1,4-benzoquinone → 3-Ethyl-6-(methyloxy)-2-phenyl-1-naphthalenol

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Reaction Steps

To a solution of 3-ethyl-6-(methyloxy)-2-phenyl-1-naphthalenyl acetate (56) (0.61 g, 1.90 mmol) in MeOH (20 mL) and THF (20 mL) was added NaOMe (0.5M in MeOH, 10 mL). The mixture was stirred at room temperature for 3 h. Cooled to room temperature, 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (1.74 g, 7.50 mmol) was added. Most of the solvent was removed and the residue was diluted with water (20 mL) and acidified with 5 N HCl. The mixture was extracted with CH2Cl2. The extracts were combined and washed with brine, dried over Na2SO4, filtered, and the filtrate was concentrated to give the crude product as a brown oil. The crude product was purified by flash chromatography over SiO2 with hexanes:EtOAc (10:1) to give 0.52 g (98%) of compound 57 as a light yellow oil. 1H NMR (400 MHz, CDCl3): δ 1.08 (t, J=7.5 Hz, 3H), 2.49 (q, J=7.5 Hz, 2H), 3.93 (s, 3H), 5.14 (s, 1H), 7.05-7.10 (m, 2H), 7.24 (s, 1H), 7.32-7.38 (m, 2H), 7.42-7.48 (m, 1H), 7.50-7.56 (m, 2H), 8.05-8.10 (m, 1H).

Provenance & Evidence