Isocyanide Addition to Pyridinium Salts. Efficient Entry into Substituted Nicotinonitrile Derivatives
作者:Nana Aba O. Williams、Carme Masdeu、José Luis Díaz、Rodolfo Lavilla
DOI:10.1021/ol062327w
日期:2006.12.1
The addition of isocyanides to pyridiniumsalts is studied. The process takes place efficiently when a carboxamido group is present in the 3 position of the pyridine ring. The outcome of the reaction involves the stabilization of the nitrilium intermediate by the amide, which suffers a mild dehydration, leading regioselectively to beta-cyano-gamma-carbamoyl-1,4-dihydropyridines. In this way, a variety