AGN 193109 Ethyl Ester → Ethyl 4-[(5,6-dihydro-5,5-dimethyl-8-(2-methylphenyl)2-naphthalenyl)ethynyl]benzoate

Participants

Reaction Steps

Employing the same general procedure as for the preparation of ethyl 4-[(5,6-dihydro-5,5-dimethyl-8-(4-methylphenyl)-2-naphthalenyl)ethynyl]benzoate (Compound 1), 200.0 mg (0.418 mmol) of ethyl 4-[(5,6-dihydro-5,5-dimethyl-8-(trifluoromethylsulfonyl)oxy-2-naphthalenyl)ethynyl]benzoate (Compound G) was converted into the title compound (colorless solid) using 199.4 mg (1.463 mmol) of zinc chloride, 24 mg (0.02 mmol) of tetrakis(triphenylphosphine)palladium(0) in 4.0 ml of THF, and 2-methylphenyl lithium (prepared by adding 133.9 mg (1.23 ml, 2.09 mmol) of tert-butyllithium (1.7M solution in pentane) to a cold solution (−78° C.) of 178.7 mg (1.045 mmol) of 2-methylbromobenzene in 2.0 ml of THF). 1H NMR (CDCl3): δ 7.97 (2H, d, J=8.4 Hz), 7.50 (2H, d, J=8.4 Hz), 7.49—7.19 (6H, m), 6.81 (1H, d, J=1.6 Hz), 5.89 (1H, t, J=4.5 Hz), 4.36 (2H, q, J=7.1 Hz), 2.43-2.14 (2H, dq, J=3.7, 5.4 Hz), 2.15 (3H, s), 1.39-1.34 (9H, m).

Provenance & Evidence