2-(5-Bromo-3-pyridyloxy)-N-(4-methylpent-2-yn-4-yl)butyramide (0.40 g), trimethylsilylacetylene (0.24 ml), copper (I) chloride (0.015 g) and palladium dichloride bis(triphenyl)phosphine (0.030 g) in dry triethylamine (4 ml) were sealed in a glass tube and heated to 90° C. for 3 hours. The mixture was cooled to ambient temperature and stored for 18 hours. Further trimethylsilylacetylene (0.24 ml) and palladium dichloride bis(triphenyl)-phosphine (0.030 g) were added and the mixture re-heated in the sealed tube for another 5.5 hours. The reaction mixture was cooled to ambient temperature, stored for 72 hours, diluted with diethyl ether and washed with water (three times). The organic phase was separated, dried over magnesium sulphate and evaporated under reduced pressure to give a dark yellow gum, ca. 0.4 g, containing the required product, which was used in the next Stage without further purification.
