N-acetylureas were synthesised regioselectivelyfrom 1,3-disubstituted selenoureas and zinc acetate. Regioselectivity was dependent on the pKa of the amine attached to the selenourea and occurred towards the amine with the lower pKa. The approach provided a simple, mild and efficient way to construct various N-acetylureas regioselectively in moderate to good yields (53–88%). A plausible mechanism was
Regioselective Acetylate of 1,3-Disubstituted Selenoureas Promoted by Recyclable Ion-Supported Hypervalent Iodine(III) Reagent
作者:Yuanyuan Xie、Haixuan Pan
DOI:10.1080/10426507.2013.797418
日期:2014.1
environmentally friendly reaction of 1,3-disubstituted selenoureas with a recyclable ion-supported hypervalent iodine(III) reagent produces regioselectively N-acetylureas. This is the first example of ion-supported hypervalent iodine reagent [dibmim]+[BF4]−being employed as an N-acetylating agent. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and