Hydrochloric Acid → 5',6'-Dihydro-5',5'-dimethyl-8'-(4-methylphenyl)-[2,2'-binaphthalene]6-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

A solution of ethyl 5′,6′-dihydro-5′,5′-dimethyl-8′-(4-methylphenyl)-2,2′-binaphthalene]-6-carboxylate (Compound 64) 0.19 g, 0.43 mmol), EtOH (8 ml) and 1N aqueous NaOH (2 ml) was heated to 60° C. for 3 hours. The solution was cooled to 0° C. and acidified with 1N aqueous HCl. The product was extracted into ethyl acetate, and the organic layers combined, washed with water, brine, dried (MgSO4), filtered and the solvent removed in-vacuo. The residue was recrystalized from THF/ethyl acetate at 0° C. to give 35 mg of pure material. The mother liquor was concentrated under reduced pressure and the residue purified by silica gel chromatography (100% ethyl acetate) to give an additional 125 mg of the title compound (overall yield=160 mg, 90%) as a colorless solid. 1H NMR (DMSO-d6) δ 8.57 (s, 1H), 8.11 (d, 1H, J=8.7 Hz), 7.96-7.82 (overlapping d's, 3H),7.65 (d, 2H, J=7.6 Hz), 7.50 (d, 1H, J=7.9 Hz), 7.28 (s, 1H), 7.26 (d, 2H, J=8.3 Hz), 7.21 (d, 2H, J=8.3 Hz), 6.01 (t, 1H, J=4.5 Hz), 3.34 (br s, 1H), 2.31 (s, 3H), 2.31 (d, 2H, J=4.5 Hz), 1.31 (s, 6H).

Provenance & Evidence