A facile and efficient synthetic route to multi-substituted 2-aminopyridines has been developed via a formal [5C + 1N] annulation of readily available 2,4-pentadienenitriles with hydroxylamine (NH2OH) under very mild conditions, which involves sequential intermolecular aza-nucleophilic addition of hydroxylamine, intramolecular aza-cyclization, and dehydration reactions.
开发了一种简便且高效的合成多取代2-
氨基吡啶的方法,通过在非常温和的条件下,将易于获得的2,4-
戊二烯腈与
羟胺(NH2OH)进行形式上的[5C + 1N]环化反应,涉及连续的分子间氮亲核加成、分子内氮环化和脱
水反应。