作者:Daniel C. Steigerwald、Bardia Soltanzadeh、Aritra Sarkar、Cecilia C. Morgenstern、Richard J. Staples、Babak Borhan
DOI:10.1039/d0sc05224h
日期:——
Intermolecular asymmetric haloamination reactions are challenging due to the inherently high halenium affinity (HalA) of the nitrogen atom, which often leads to N-halogenated products as a kinetic trap. To circumvent this issue, acetonitrile, possessing a low HalA, was used as the nucleophile in the catalytic asymmetric Ritter-type chloroamidation of allyl-amides. This method is compatible with Z and
由于氮原子固有的高卤素亲和力 (HalA),分子间不对称卤化反应具有挑战性,这通常会导致N-卤化产物作为动力学陷阱。为了避免这个问题,具有低 HalA 的乙腈被用作烯丙基酰胺催化不对称 Ritter 型氯酰胺化的亲核试剂。此方法与Z和E兼容具有烷基和芳族取代基的烯烃。在许多例子中,温和的酸性后处理显示 1,2-氯酰胺产品的对映体过量超过 95%。我们还报告了在这种由氯引发的催化不对称 Ritter 型反应中成功使用磺胺氯试剂二氯胺-T。简单的修饰导致手性咪唑啉、胍和正交保护的 1,2,3 手性三胺。