Metal-Free Oxidative Cyclization of Urea-Tethered Alkenes with Hypervalent Iodine
作者:Brian M. Cochran、Forrest E. Michael
DOI:10.1021/ol8022165
日期:2008.11.6
A metal-free oxidative cyclization of ureas onto unactivated alkenes using iodosylbenzene and an acid promoter is described. The products isolated are predominantly bicyclic isoureas resulting from an intramolecular oxyamination reaction. The acid type and urea substitution have a strong effect on the product formed. A variety of substrates form the isourea with high diastereoselectivity via syn addition