Hydrochloric Acid → 4-[(5,6-Dihydro-5,5-dimethyl-8-(4-methylphenyl)-2-naphthalenyl)azo]-benzoic acid

関与物質

反応手順

To a solution of ethyl 4-[(5,6-dihydro-5,5-dimethyl-8-(4-methylphenyl)-2-naphthalenyl)azo]-benzoate (Compound 46a) 16.5 mg, 0.042 mmol) in THF (2 ml) and ethanol (1 ml) was added 80.0 mg (2.00 mmol) of NaOH (2.0 ml, 1M aqueous solution). The mixture was stirred for 12 hours at room temperature, acidified with 10% HCl, and extracted with EtOAc. The combined organic layers were washed with water, and saturated aqueous NaCl, then dried over MgSO4. Removal of the solvents under reduced pressure, and recrystallization of the residue from EtOAC/hexane, afforded the title compound as a red solid. 1H NMR (acetone-d6): δ 8.19 (2H, d, J=8.4 Hz), 7.92 (2H, d, J=8.5 hz), 7.88 (2H, dd, J=2.1, 6.1 Hz), 7.66 (1H, s), 7.64 (2H, d, J=2.3 Hz), 7.28 (4H, d, J=3.0 Hz), 6.09 (1H, t, J=2.5 Hz), 2.42 (2H, d, J=4.8 Hz), 2.39 (3H, s), 1.40 (6H, s).

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