Triethylamine → 3-[2-(4-[1,3,4-Oxadiazol-2-yl]phenyl)ethynyl]-3-hydroxyquinuclidine

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A mixture of 3-ethynyl-3-hydroxyquinuclidine (1.06 g), 2-(4-bromopbenyl)-1,3,4-oxadiazole (1.58 g), bis(triphenylphosphine)palladium (II) chloride (245 mg), copper (I) iodide (123 mg), triethylamine (7 ml) and dimethylformamide (14 ml) were heated at 65° C. under an atmosphere of argon for 4 hours. The triethylamine and DHF were removed by evaporation. An aqueous solution of sodium hydroxide (2M, 20 ml) was added to the residue and the mixture extracted with dichloromethane (3×30 ml). The organic extracts were combined, dried (MgSO4) and evaporated. The residue was purified by flash column chromatography on silica gel eluting with 10% methanol in dichloromethane containing 1% ammonia (density 0.88 g/cm3) to give 3-[2-(4-[1,3,4-oxadiazol-2-yl]phenyl)ethynyl]-3-hydroxyquinuclidine (811 mg) as a solid, m.p. 229-230%; microanalysis, found: C, 67.9; H, 5.8; N, 14.2%; C17H17N3O3. 0.4 H2O requires: C, 67.5; H, 5.9; N, 13.9; NMR: 1.20-1.44(1H,m), 1.50-1.71(1H,m), 1.77-2.04(3H,m), 2.69(4H,t), 2.79-2.94(1H,d), 3.04-3.20(1H,d), 5.69(1H,s), 7.63(2H,d), 8.03(2H,d), 9.35(1H,s); m/z 296(M+H).

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