Pyridazines. Part 30:Palladium-Catalysed Synthesis of 5-Substituted 6-Phenyl-3(2<i>H</i>)-pyridazinones Asissted by a Retro-Ene Transformation
作者:Eddy Sotelo、Alberto Coelho、Enrique Raviña
DOI:10.1055/s-2002-35567
日期:——
The efficient one-pot functionalization, through palladium-catalysed reactions, of position 5 of the 6-phenyl-3(2H)-pyridazinonesystem has been performed using a retro-ene-assisted fragmentation. This route allows accessthrough a short synthetic sequence to several pharmacologically useful 3(2H)-pyridazinones.
A convenient and efficient palladium-catalysed retro-ene-assisted method has been developed to prepare a series of 5-substituted-6-phenyl-3(2H)-pyridazinones as potential antiplatelet drugs. The most active compounds were those that contain a 3-phenyl-3-oxo-propenyl fragment or a phenylthio group at position 5 of the heterocyclic ring. (C) 2003 Elsevier Ltd. All rights reserved.
Pyridazines Part XXIII: Efficient Arylation at Position 5 of the 6-Phenyl-(2H)-pyridazin-3-one System Using a Suzuki Cross-Coupling Reaction
A highly efficient procedure for introducing aryl or heteroaryl rings at position 5 of the 6-phenyl-(2H)-pyridazin-3-one system using a Suzuki cross-coupling reaction has been developed in the search for new platelet aggregation inhibitors.