Benzoic acid, 4-((5,6,7,8-tetrahydro-5,5-dimethyl-8-oxo-2-naphthalenyl)ethynyl)-, ethyl ester → Ethyl 4-[(5-hydroxy-8,8-dimethyl-5-carboethoxymethyl-5,6,7,8-tetrahydronaphth-3-yl)ethynyl]benzoate

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Employing the same general procedure as for the preparation of ethyl 4-[(7,8-dihydro-5-hydroxy-8,8-dimethyl-5-carboethoxymethylnaphth-2-yl)ethynyl]benzoate (Compound 113), 1.00 g (2.88 mmol) of ethyl 4-[(5,6,7,8-tetrahydro-8,8-dimethyl-5-oxonaphth-3-yl)ethynyl]benzoate (Compound 2) was converted into the title compound (light yellow solid) using 1.00 g (15.30 mmol) of zinc, 0.639 ml (5.76 mmol) of ethyl bromoacetate and 70 ml of dry benzene.

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