Regioselective Nucleophilic Addition to Pyridinium Salts: A New Route to Substituted Dihydropyridones
作者:Timothy J. Donohoe、Matthew J. Connolly、Lesley Walton
DOI:10.1021/ol902402v
日期:2009.12.3
The regioselective addition of nucleophiles to pyridinium salts generates an intermediate enol-ether, which can be hydrolyzed in situ to provide a range of dihydropyridones. Certain Grignards have shown inherent differences in the regioselectivity of addition to these salts, and this difference can be tuned to give single regioisomeric addition products. The dihydropyridone products can be further
Partial Reduction of Pyridinium Salts as a Versatile Route to Dihydropyridones
作者:Timothy J. Donohoe、Dale J. Johnson、Laura H. Mace、Mark J. Bamford、Osamu Ichihara
DOI:10.1021/ol0476624
日期:2005.2.1
[reaction: see text] The addition of two electrons to a pyridinium salt turns it into a nucleophile. The intermediate generated by the reduction of such salts can be reacted successfully with a range of different electrophiles (acids, alkyl halides, and carbonyl compounds) and the intermediate hydrolyzed in situ to provide a wide range of dihydropyridones. Each position on the dihydropyridone ring