Pyridazines XVII: An Efficient Palladium-Catalyzed Cross-Coupling Reaction for the Synthesis of 5-Substituted 6-Phenyl-(2H)-pyridazin-3-ones
作者:Isabel Estevez
DOI:10.1055/s-1999-3567
日期:1999.9
Pyridazines. Part 25: Efficient and selective deprotection of pharmacologically useful 2-MOM-pyridazinones using Lewis acids
作者:Eddy Sotelo、Alberto Coelho、Enrique Raviña
DOI:10.1016/s0040-4039(01)01898-6
日期:2001.12
An efficient and selective procedure for the cleavage of a methoxymethyl group at the 2-position in acid-sensitive pyridazinones is presented. Deprotection with Lewis acids (boron tribromide or aluminium chloride) affords 3(2H)-pyridazinones under mild conditions without affecting multiple bonds in substituents. (C) 2001 Elsevier Science Ltd. All rights reserved.
Pyridazine derivatives. Part 33: Sonogashira approaches in the synthesis of 5-substituted-6-phenyl-3(2H)-pyridazinones
作者:Alberto Coelho、Eddy Sotelo、Enrique Raviña
DOI:10.1016/s0040-4020(03)00263-1
日期:2003.3
Several 6-phenyl-3(2H)-pyridazinones bearing different alkynyl groups at position 5 have been prepared by a palladium-catalysed Sonogashira cross-coupling reaction. An interesting base-promoted electronically permitted isomerization has been observed during the coupling of 1-phenyl-2-propyn-1-ol. This rearrangement afforded the E-chalcone 6 in excellent yield.
Pyridazine derivatives. Part 40: Reactivity of 5-alkynylpyridazin-3(2H)-ones toward hydrochloric acid
作者:Alberto Coelho、Héctor Novoa、Oswald M. Peeters、Norbert Blaton、Mario Alvarado、Eddy Sotelo
DOI:10.1016/j.tet.2005.03.021
日期:2005.5
H)-ones or 5-(2-chloroalkenyl)pyridazin-3(2H)-ones were isolated during the cleavage of the methoxymethyl group in a series of 5-alkynyl-2-methoxymethylpyridazin-3(2H)-ones by treatment with hydrochloricacid. The efficient and selective cleavage of the methoxymethyl group in these compounds can be performed under mild conditions by employing aluminium chloride.