Reaction Steps
A mixture of ethyl (±)-10,11-dihydro-3-(trifluoromethanesulfonyloxy)-5H-dibenzo[a,d]cycloheptene-10-acetate (1.34 g, 3.13 mmole), 4-(2-tetrahydropyranyloxy)-1-tributylstannyl-1-butyne (1.66 g, 3.76 mmole), LiCl (398 mg, 9.39 mmole), bis(triphenylphosphine)palladium dichloride (110 mg, 0.094 mmole), and anhydrous dioxane (31 mL) was heated at reflux under argon. After 1.5 hr, the reaction was concentrated to remove most of the dioxane, and the residue was taken up in Et2O (100 mL). 10% KF (50 mL) was added and the mixture was stirred briskly for 0.5 hr. The aqueous layer was removed and the Et2O layer was filtered through a mixture of celite® and MgSO4. The filtrate was concentrated and the residue was chromatographed on silica gel (10% EtOAc/hexanes) to afford the title compound (1.12 g, 83%) as a pale yellow oil: TLC (20% EtOAc/hexanes) Rf 0.40; 1H NMR (400 MHz, CDCl3) δ 7.21-7.30 (m, 1 H), 7.06-7.20 (m, 5 H), 7.00 (d, J=7.8 Hz, 1 H), 4.69 (t, J=3.6 Hz, 1 H), 4.31 (d, J=15.2 Hz, 1H), 4.11-4.23 (m, 2 H), 3.76-3.97 (m, 4 H), 3.59-3.68 (m, 1 H), 3.48-3.57 (m, 1 H), 3.34 (dd, J=15.2, 4.1 Hz, 1H), 2.97 (dd, J=15.2, 9.5 Hz, 1 H), 2.70 (t, J=7.3 Hz, 2 H), 2.65 (dd, J=15.7, 4.8 Hz, 1 H), 2.51 (dd, J=15.7, 9.5 Hz, 1 H), 1.78-1.92 (m, 1H), 1.68-1.78 (m, 1 H), 1.44-1.68 (m, 4 H), 1.27 (t, J=7.1 Hz, 3 H); MS (ES) m/e 455 (M+Na)+.
