synthesis. However, such enantiocontrol on tetrahedral ammonium cations remains challenging. Described here is the first example of using chiral anion phase‐transfer catalysis to achieve intermolecular ring‐opening of azetidiniums with excellent enantioselectivity (up to 97 % ee). Precise control over the formation and reaction of the chiral ion pair as well as inhibition of the background reaction by the
抗衡离子诱导的立体控制是有机合成中的强大工具。然而,对四面体
铵阳离子的这种对映体控制仍然具有挑战性。这里描述的是第一个使用手性阴离子相转移催化实现氮杂
环丁烷的分子间开环并具有出色的对映选择性(最高97%ee)的例子。精确控制手性离子对的形成和反应以及通过双相系统抑制背景反应是反应成功的关键。