C = C键上的对映选择性CH代表手性碳-碳骨架的构建中最有效的原子路线,这是有机合成的主要研究课题。我们在此报告了2-甲基氮杂芳烃(例如2-甲基吡啶)的对映选择性钇催化的C(sp 3)-H键加成到各种取代的环丙烯和降冰片烯上。此过程有效地提供了高收率和高对映选择性(高达ee高达97%)的手性吡啶基甲基官能化的环丙烷和降冰片烷衍生物新家族。
Rapid access to cyclopentadiene derivatives through gold-catalyzed cycloisomerization of ynamides with cyclopropenes by preferential activation of alkenes over alkynes
A mild rhodium catalytic system has been developed to synthesize vinylcyclopropa[b]indolines through cyclopropanation of indoles with vinyl carbenoids generated from ringopening of cyclopropenes in situ. By employing a Rh-migration strategy, the products can be obtained with good to excellent E:Z ratios (≤99:1) and complete diastereoselectivity (≤99:1). This method is easy, has a low catalyst loading
已开发出一种温和的铑催化体系,通过将吲哚与原位环丙烯开环生成的乙烯基类胡萝卜素进行环丙烷化,来合成乙烯基环丙烷[ b ]二氢吲哚。通过采用Rh迁移策略,可以获得具有良好或优异的E:Z比(≤99:1)和完全非对映选择性(≤99:1)的产物。该方法容易,催化剂负载低并且适用于广泛的功能。
Synthesis of Chiral Aminocyclopropanes by Rare-Earth-Metal-Catalyzed Cyclopropene Hydroamination
structures are important components of biologically active natural products and pharmaceuticals. We herein report the enantioselective intermolecularhydroamination of substituted cyclopropenes with various amines catalyzed by chiral half‐sandwich rare‐earth‐metal complexes. This method constitutes a 100 % atom‐efficient route for the synthesis of a variety of chiral α‐aminocyclopropane derivatives in high
atom-efficient route for the synthesis of a wide range of enantioenriched alkynylcyclopropane derivatives in high yields (65–96%) and excellent stereoselectivity (>20:1 dr; 90–99% ee). Elaboration of some of the alkynylcyclopropane products through selective transformation of the C≡C moiety has also been demonstrated to give further diversified chiral cyclopropane derivatives which are otherwise difficult
Rapid access to cyclopentadiene derivatives through gold-catalyzed cycloisomerization of ynamides with cyclopropenes by preferential activation of alkenes over alkynes