On the Chemistry of Pyrazolylalkines; Pyrazoles II.
Palladium-catalyzed reactions of 1-benzoyl-4-iodopyrazole (2a) with monosubstituted acetylenes 3a,3b and 3c in triethylamine solution provide convenient access to the cross-coupled products 4a,4b and 4c.The 4-ethinylpyrazoles 5a and 7 obtained after metha