Base-Controlled Selectivity in the Synthesis of Linear and Angular Fused Quinazolinones by a Palladium-Catalyzed Carbonylation/Nucleophilic Aromatic Substitution Sequence
作者:Jianbin Chen、Kishore Natte、Anke Spannenberg、Helfried Neumann、Peter Langer、Matthias Beller、Xiao-Feng Wu
DOI:10.1002/anie.201402779
日期:2014.7.14
A new approach for the facile synthesis of fused quinazolinone scaffolds through a palladium‐catalyzed carbonylative coupling followed by an intramolecular nucleophilic aromatic substitution is described. The base serves as the key modulator: Whereas DBU gives rise to the linear isomers, Et3N promotes the preferential formation of angular products. Interestingly, a light‐induced 4+4 reaction of the
描述了一种新的方法,该方法可通过钯催化的羰基化偶联,然后进行分子内亲核芳族取代,轻松合成稠合的喹唑啉酮骨架。该基团起着关键的调节剂的作用:DBU产生线性异构体,而Et 3 N则促进了优先形成角产物。有趣的是,还观察到了产物的光诱导4 + 4反应。