Formation of dihydrobenzofurans by radical cyclization
作者:Athelstan L. J. Beckwith、Gordon F. Meijs
DOI:10.1039/c39810000136
日期:——
A survey of methods for the generation of aryl radicals from o-alkenyloxyarene diazonium salts demonstrates that dihydrobenzofuran derivatives can be efficiently formed by treatment of (1) or (2) with Bun3SnH–Et2O or with NaI–Me2CO; methods utilising the iodo-compound (3; X = I) are less effective.
对由邻链烯基氧基芳烃重氮盐生成芳基的方法的调查表明,通过用Bu n 3 SnH–Et 2 O或NaI–Me 2 CO处理(1)或(2),可以有效地形成二氢苯并呋喃衍生物。; 利用碘化合物(3 ; X = I)的方法效果较差。
Copper-catalyzed carbochlorination or carbobromination via radical cyclization of aryl amines
作者:Jianing Ouyang、Xiaolong Su、Yu Chen、Yaofeng Yuan、Yi Li
DOI:10.1016/j.tetlet.2016.02.054
日期:2016.3
A copper-catalyzed radical carbochlorination or carbobromination is reported. Intramolecular cyclization occurred through aryl radicals generated in situ from bench-stable aryl amines with aqueous hydrogen halides as the halogen sources. A variety of (3-halomethyl)-1,2-dihydrobenzofuran derivatives were prepared in up to 92% yield through this one-pot protocol utilizing widely available starting materials