Organocatalytic Enantioselective α-Bromination of Aldehydes with <i>N</i>-Bromosuccinimide
作者:George Hutchinson、Carla Alamillo-Ferrer、Martín Fernández-Pascual、Jordi Burés
DOI:10.1021/acs.joc.2c00600
日期:2022.6.17
four examples reported to date require expensive, inconvenient brominating agents to achieve the desired products in excellent yields and enantioselectivities. The preferred brominating agent, N-bromosuccinimide (NBS), has been repeatedly discarded for these reactions because it results in low yields and relatively poor enantioselectivities. We describe a methodology that uses NBS and performs excellently
尽管存在大量的有机催化、对映选择性转化,但醛的 α-溴化仍然是一个具有挑战性的反应。迄今为止报道的四个例子需要昂贵且不方便的溴化剂才能以优异的收率和对映选择性获得所需的产品。优选的溴化剂N-溴代琥珀酰亚胺 (NBS) 已在这些反应中反复丢弃,因为它导致低产率和相对较差的对映选择性。我们描述了一种使用 NBS 并在低催化剂负载、短反应时间和温和温度下表现出色的方法。