Asymmetric Synthesis of Spiro β-Lactams<i>via</i>a Squaramide- Catalyzed Sulfa-Michael Addition/Desymmetrization Protocol
作者:Pankaj Chauhan、Suruchi Mahajan、Uğur Kaya、Arto Valkonen、Kari Rissanen、Dieter Enders
DOI:10.1002/adsc.201600554
日期:2016.10.20
An efficient asymmetric synthesis of spirocyclohexenone β‐lactams bearing three contiguous stereocenters has been achieved in moderate to good yields and high stereoselectivities. The protocol involves the combination of a squaramide‐catalyzed sulfa‐Michael addition under desymmetrization via a dynamic kinetic resolution of racemic 2,5‐cyclohexadienones.
一种高效的不对称合成螺环己烯酮β-内酰胺的方法,该方法具有三个连续的立体中心,产率中等至良好,立体选择性高。该方案涉及在外消旋下通过外消旋2,5-环己二酮的动态动力学拆分在非对称化条件下结合方胺催化的磺胺-迈克尔加成反应。