Application of the palladium-catalyzed N-arylation of hydrazones to deactivated heteroaryl halides in the synthesis of pyrazoles
摘要:
A versatile synthesis of heteroaryl pyrazoles from deactivated heteroaryl halides was demonstrated with different 1,3-bifunctional substrates under acidic conditions. Practical conditions for the transhydrazonation/cyclization step were developed. (C) 2004 Elsevier Ltd. All rights reserved.
The present invention provides novel compounds and ligands that are useful in transition metal catalyzed cross-coupling reactions. For example, the compounds and ligands of the present invention are useful in palladium or gold catalyzed cross-coupling reactions.