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All articles of this category Functionalised pyrazoles have been prepared in good overall yield through a facile one-pot procedure. The synthesis includes the palladium-catalysed coupling of the readily available N-tosyl-N-propargylhydrazine with aryl iodides or vinyl triflates, the palladium-catalysed annulation of the resulting N-tosyl-N-(1-aryl/vinyl-1-propyn-3-yl)hydrazine and exposure of the reaction mixture arising from the annulation step to KOBu t . pyrazoles - palladium catalysis - coupling - annulation - aryl iodides - vinyl triflates
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Cacchi et al. (1997) studied this question.
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