4-[2-[5,6-Dihydro-5,5-dimethyl-8-[[(trifluoromethyl)sulfonyl]oxy]-2-naphthalenyl]ethynyl]benzoic acid ethyl ester → Ethyl 4-[(7,8-dihydro-5,8,8-trimethylnaphth-3-yl)ethynyl]benzoate

Participants

Reaction Steps

Employing the same general procedure as for the preparation of ethyl 4-[(7,8-dihydro-8,8-dimethyl-5-(1,1-dimethylethyl)naphth-3-yl)ethynyl]benzoate (Compound 71), 250 mg (0.52 mmol) of ethyl 4-[(5-trifluoromethylsulfonyloxy-7,8-dihydro-8,8-dimethylnaphth-3-yl)ethynyl]benzoate (Compound 66) was converted into the title compound (HPLC Partisil 10, 0.5% EtOAC-hexanes) using 70.2 mg (0.78 mmol) of cuprous cyanide, 33.2 mg (0.78 mmol) of lithium chloride and 34.5 mg (1.28 ml, 1.57 mmol) of methyl-lithium (1.22M solution in Et2O).

Provenance & Evidence