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Enantioselective desymmetrization and parallel kinetic resolution of cyclopropanes via C–C activation: Synthesis of chiral β-lactams
Chem ( IF 19.1 ) Pub Date : 2024-09-05 , DOI: 10.1016/j.chempr.2024.08.005
Hao Wu , Yiyao Wang , Shiyuan Sui , Gongming Chen , Lei Wang , Jiaxin Yang , Junbiao Chang , Dachang Bai

β-Lactams are privileged and appealing motifs in medicinal chemistry. Herein, we report enantioselective desymmetrization and parallel kinetic resolution of aminocyclopropanes for the synthesis of chiral β-lactams through Rh(I)-catalyzed asymmetric C–C bond activation. The chiral Rh(I) catalyzed C–C bond cleavage of aminocyclopropanes first and then underwent β-hydride elimination to generate π-allylic hydridorhodium(III) intermediates, which could be trapped by tethered alkyne units, and gave various strained chiral β-lactams with excellent regio- and enantioselectivity (90%–99% ee). Moreover, parallel kinetic resolution was realized when using unsymmetrical aminocyclopropanes with pre-existing C2-stereocenters through C–C bond activation, delivering two types of β-lactams in one pot with excellent enantiomeric excesses. Notably, these systems achieve complete atom and step economy. The obtained enantioenriched β-lactams exhibit the capability to undergo a variety of stereospecific transformations. Theoretical calculations reveal the origin of enantioselectivity and support the alkyne unit insertion to allylic Rh(III) –C bond mechanisms.

中文翻译:


通过 C-C 活化对环丙烷进行对映选择性去对称化和平行动力学分离:手性 β-内酰胺的合成



β-内酰胺是药物化学中特权且吸引人的基序。在此,我们报道了氨基环丙烷通过 Rh(I) 催化的不对称 C-C 键激活合成手性 β-内酰胺的对映选择性去对称和平行动力学分离。手性 Rh(I) 首先催化氨基环丙烷的 C-C 键裂解,然后进行β-氢化物消除,生成π-烯丙基氢铵 (III) 中间体,其可以被栓系炔烃单元捕获,并得到各种应变的手性 β-内酰胺,具有优异的区域选择性和对映选择性 (90%–99% ee)。此外,当使用 具有预先存在的 C2 立体中心的不对称氨基环丙烷时,通过 C-C 键激活实现了平行动力学分辨率,在一个罐中提供了两种类型的 β-内酰胺,具有出色的对映体过量。值得注意的是,这些系统实现了完整的原子和步骤经济性。获得的对映体富集 β-内酰胺类表现出进行各种立体特异性转化的能力。理论计算揭示了对映选择性的起源,并支持炔烃单元插入烯丙基 Rh(III) –C 键机制。
更新日期:2024-09-05
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