Coupling and Cycloaddition Reactions

2-Ethoxycarbonylethylzinc iodide has been shown to couple with aryl and vinyl iodides under palladium catalysis to produce ethyl 

3-arylpropionates and ethyl pent-4-enoates respectively in good 

A new route to conjugated enynes has been reported which involves cross-coupling of enol triflates with 1-alkynes in the 

Palladium-catalysed coupling reactions have been employed in two notable syntheses. A 5-halogenopyrimidine reacts with methyl acrylate in the presence of a palladium catalyst to give a methyl (E)-B-pyrimidinyl acrylate. Treatment with acid leads to (E)-B-(2, 

Several novel Diels-Alder cycloadditions involving transition 

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Diene-l,6-diones have been synthesized from dienetricarbonyliron complexes in good yield via a route involving two Friedel-Crafts acylation steps (Scheme 41).61 via Coupling and Cycloaddition Reactions - Optically active allysilanes have been prepared by a cross-coupling reaction catalysed by an optically active ferrocenylphosphine-palladium complex (Scheme 42). 6 ... 

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