Triphenylphosphine → 4-(2-[4-Carbomethoxymethyloxyphenyl]ethynyl)-4-(3-cyclopentyloxy-4-methoxyphenyl)-1,1-(ethylenedioxy)cyclohexane

Participants

Reaction Steps

A stirred mixture of 4-(3-cyclopentyloxy-4-methoxyphenyl)-1,1-(ethylenedioxy)-4-ethynylcyclohexane (0.075 g, 0.21 mmol) and 4-iodophenoxyacetic acid methyl ester (0.060 g, 0.21 mmol, prepared as described in Example 35a) in dry triethylamine (2 mL) was treated at 80° C. for 1.5 hr by the procedure of Example 11 with a mixture of tetrakis(triphenylphosphine)palladium (0.018 g, 0.016 mmol), cuprous iodide (0.004 g, 0.021 mmol), and triphenylphosphine (crystal). The crude product was chromatographed (silica 40 to 50% ethyl acetate in hexanes) and stripped in vacuo to afford the tided intermediate as a dark red oil (0.080 g, 73%). 1H-NMR (400 MHz, CDCl3) δ 7.98 (d, 9.4 Hz, 2H), 7.50 (d, J=9.4 Hz, 2H), 7.20 (d, J=1.9 Hz, 1H), 7.12 (d-d, J=1.9 Hz, J=8.6 Hz, 1H), 6.84 (d, J=8.6, 1H), 4.80 (p, J=3.8 Hz, 1H), 4.00 (s, br, 4H), 3.92 (s, 3H), 3.85 (s, 3H), 2.3 to 1.5 (m, 17H with H2O).

Provenance & Evidence