Revisiting the Urech Synthesis of Hydantoins: Direct Access to Enantiopure 1,5-Substituted Hydantoins Using Cyanobenziodoxolone
作者:Nina Declas、Franck Le Vaillant、Jerome Waser
DOI:10.1021/acs.orglett.8b03843
日期:2019.1.18
synthesis of enantiopure 1,5-substituted hydantoins was developed using a hypervalent iodine cyanation reagent (cyanobenziodoxolone, CBX) as a source of electrophilic carbon. Starting from inexpensive commercially available enantiopure protected amino acids, the method allowed the synthesis of various hydantoins without epimerization. Formation of hydantoins from dipeptides was also possible, but partial
使用高价碘氰化试剂(cyanobenziodoxolone,CBX)作为亲电碳源,开发了一种对映体纯的1,5-取代的乙内酰脲的合成方法。从便宜的可商购的对映纯保护的氨基酸开始,该方法允许在没有差向异构化的情况下合成各种乙内酰脲。由二肽形成乙内酰脲也是可能的,但是在这种情况下观察到部分差向异构。这种合成策略对用户友好,因为CBX是一种稳定的易于处理的结晶试剂,并且避免了常规的多步操作规程,因此可以轻松合成手性乙内酰脲文库。