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 pyridinium salts 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
研究了向吡啶鎓盐中添加异氰化物。当在吡啶环的3位上存在羧酰胺基时,该过程有效地进行。该反应的结果涉及酰胺对腈中间体的稳定作用,该酰胺遭受轻度脱水,区域选择性地导致β-氰基-γ-氨基甲酰基-1,4-二氢吡啶。这样,各种烟酰胺衍生物被氨基甲酰化。还报道了扩展到喹啉鎓盐,异喹啉鎓盐和N-酰基吡啶鎓盐。[反应:看文字]