Branched Amine Synthesis via Aziridine or Azetidine Opening with Organotrifluoroborates by Cooperative Brønsted/Lewis Acid Catalysis: An Acid-Dependent Divergent Mechanism
作者:Truong N. Nguyen、Jeremy A. May
DOI:10.1021/acs.orglett.8b01394
日期:2018.6.15
A practical catalytic method to synthesize β,β- and γ,γ-substituted amines by opening aziridines and azetidines, respectively, using alkenyl, alkynyl, or aryl/heteroaryl trifluoroborate salts is described. This reaction features simple open-flask reaction conditions, the use of transition-metal-free catalysis, complete regioselectivity, and high diastereoselectivity. Preliminary mechanistic studies
描述了一种实用的催化方法,该方法通过使用烯基,炔基或芳基/杂芳基三氟硼酸盐分别打开氮丙啶和氮杂环丁烷来合成β,β-和γ,γ-取代的胺。该反应具有简单的开瓶反应条件,使用无过渡金属的催化,完全的区域选择性和高的非对映选择性。初步的机理研究表明,碳正离子形成是不利的。存在布朗斯台德酸时,有利于立体定向添加,而在不存在立体异构时,则有利于立体转化,这表明存在不同的机理。