The regioselective synthesis of N-alkyl pyridones can be facilitated by alkylation of 2-methoxypyridines with activated halides. The syntheses are facile and high yielding with no traces of 2-alkoxypyridines.
A Manganese-promoted direct oxidative C−P bond formation between 2-pyridones and secondary phosphine oxides has been developed. The reported protocol proceeds under mild reaction conditions, and the C3-phosphinoylation is proposed to take place under a radical process in the presence of substoichiometric amount of Mn(II).
A class of 4-hydroxy-2(1H)-quinolone derivatives, substituted at the 3-position by an N-linked heteroaromatic ring system, are selective non-competitive antagonists of NMDA receptors and/or are antagonists of AMPA receptors, and are therefore of utility in the treatment of conditions, such as neurodegenerative disorders, convulsions or schizophrenia, which require the administration of an NMDA and or AMPA receptor antagonist.
Herein, we report a novel regioselective [2 + 1] cyclization reaction of 2-pyridones with carbenes generated in situ via visible light irradiation, without the requirement for catalysts or additives. The diverse functional groups of 2-pyridones and diazo compounds exhibit good tolerance, enabling the rapidsynthesis of highly valuable cyclopropanated dihydro-2-pyridone scaffolds with exceptional regio-
Herein is described a mild and effective iodination method using bis-(trifluoroacetoxy)iodobenzene-iodine as reagent to be applied to electron deficient heterocyclic systems (protected indoles, coumarin...). Moreover, sensitive protecting groups such as acetyl and tert-butyldimethylsilyl were found to be stable under the new iodination reaction conditions. (C) 1998 Elsevier Science Ltd. All rights reserved.