Metal-Mediated Cyclization of Aryl and Benzyl Glycidyl Ethers: A Complete Scenario
作者:Rocío Marcos、Carles Rodríguez-Escrich、Clara I. Herrerías、Miquel A. Pericàs
DOI:10.1021/ja8062887
日期:2008.12.17
Enantiomerically pure aryl and benzyl glycidyl ethers undergo stereospecific cyclizations leading to 3-chromanols or to tetrahydrobenzo[c]oxepin-4-ols under mild conditions in the presence of a catalytic amount of FeBr3/3AgOTf. The same processes are also mediated, albeit in a much less efficient manner, by AuCl3/3AgOTf. The set of active mediators in this group of processes (BF3 x Et2O, FeBr3, FeBr3/3AgOTf
在催化量的 FeBr3/3AgOTf 存在下,在温和条件下,对映异构纯的芳基和苄基缩水甘油醚发生立体有择环化反应,生成 3-苯并[c]oxepin-4-醇或四氢苯并[c]oxepin-4-醇。同样的过程也由 AuCl3/3AgOTf 介导,尽管以低得多的方式进行。这组过程中的一组活性介质(BF3 x Et2O、FeBr3、FeBr3/3AgOTf、AuCl3/3AgOTf)显示了其作为 Friedel-Crafts 反应的性质,并且不喜欢芳基金物种的中介。