Naphthalene-catalysed Lithiation of Chlorinated Nitrogenated Aromatic Heterocycles and Reaction with Electrophiles
作者:Inmaculada Gómez、Emma Alonso、Diego J Ramón、Miguel Yus
DOI:10.1016/s0040-4020(00)00318-5
日期:2000.6
Naphthalene catalysed reductive lithiation of various chloroazines (1, 7, 10, 13) in the presence of different electrophiles yields, after hydrolysis, the expected functionalised heterocycles with one (2, 8), two (11, 14a–d) and three nitrogen atoms in the ring (14e,f). This methodology allowed us to trap in situ the lithium imine derived from the reaction of 2-pyridyllithium with benzonitrile, by
萘催化各种chloroazines的还原性锂化(1,7,10,13以不同的亲电子的产率的情况下),在水解后,预期的官能化杂环与一个(2,8),两个(11,14A - d)和三个氮环(14e,f)中的原子。这种方法使我们能够在烷氧基钛存在下,通过与格氏试剂反应,将2-吡啶基锂与苄腈反应衍生的亚胺锂原位捕获。2,4-二甲氧基嘧啶(14a,c,d)在酸性条件下脱甲基,得到相应的尿嘧啶衍生物16。