to afford bicyclic pyridines. Careful screening of nitrile components revealed that a C[triple chemical bond]C triple bond or heteroatom substituents, such as methoxy and methylthio groups, proved to act as the coordinating groups, whereas C==C or C==O double bonds and amino groups failed to promote cycloaddition. This suggests that coordinating groups with multiple pi-bonds or lone pairs are essential
在催化量的[Cp * RuCl(cod)](Cp * =五
甲基环戊二烯,cod =
1,5-环辛二烯)的存在下,使1,6-二炔与带有配位基团的腈发生
化学和区域选择性反应在室温下,例如二
氰化物或α-卤代腈,得到双环
吡啶。仔细筛选腈成分显示,证明C [三
化学键] C三键或杂原子取代基(例如甲
氧基和甲
硫基)充当配位基团,而C == C或C == O双键和
氨基团体未能促进环加成反应。这表明具有多个π键或孤对的配位基团对于腈组分是必不可少的。