Three‐component [3 + 3] heterocyclizations have been established undermicrowaveirradiation, providing a flexible synthetic approach toward bicyclicfusedpyridines. 3,5‐Dibenzylidenedihydro‐2H‐pyran‐4(3H)‐ones were subject with malononitrile and aromatic amines in cosolvent of HOAc and N,N‐dimethylformamide, affording 10 examples of pyrano[4,3‐b]pyridine derivatives in good to excellent yields. Similarly
在微波辐射下已经建立了三组分[3 + 3]杂环,为双环稠合吡啶提供了灵活的合成方法。3,5-二苄基二氢-2 H-吡喃-4(3 H)-酮与丙二腈和芳香胺在HOAc和N,N-二甲基甲酰胺的共溶剂中共存,提供了10个吡喃并[4,3- b ]吡啶衍生物实例高产到高产。同样,使用硫拴系杂环作为反应伙伴,获得了七个硫吡喃并[4,3- b ]吡啶衍生物的实例。
γ-Pyrones by Isomerization. Substituted 3,5-Dibenzyl-4H-pyran-4-ones