Triethylamine → E-3-[2-{4-(5-methyl-1,2,4-oxadiazol-3-yl)phenyl}ethenyl]quinuclidine

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Reaction Conditions

Reaction Steps

A mixture of 3-(4-iodophenyl)-5-methyl-1,2,4-oxadiazole (1.43 g), 3-vinylquinuclidine (685 mg), bis(triphenylphosphine)palladium (II) chloride (175 mg), copper (I) iodide (90 mg) and triethylamine (5.0 ml) in dry dimethylformamide (10 ml) was stirred under argon at 100° C. for 5 hours. The dimethylformamide and triethylamine were removed by evaporation. The residue was treated with 2M aqueous sodium hydroxide solution (20 ml) and extracted with dichloromethane (3×20 ml). The organic extracts were washed with water (20 ml), dried (MgSO4) and evaporated. The residue was purified by flash column chromatography on silica gel using 5% methanol in dichloromethane containing 0.5% ammonia (density, 0.88 g/cm3) as eluent to give E-3-[2-{4-(5-methyl-1,2,4-oxadiazol-3-yl)phenyl}ethenyl]quinuclidine (150 mg) as a solid, m.p. 93°-97° C.; NMR: 1.4(1H,m), 1.65(2H,m), 1.8(2H,m), 2.55(1H,m), 2.65(3H,s), 2.8(4H,m), 3.08(1H,m), 3.45(1H,m), 6.5(1H,d), 6.62(1H,d,d), 7.6(2H,d) and 7.82(2H,d).

Provenance & Evidence