Asymmetric, radical C–H functionalizations are rare but powerful tools for solving modern synthetic challenges. Specifically, the enantio- and regioselective C–H amination of alcohols to access medicinally valuable chiral β-amino alcohols remains elusive. To solve this challenge, a radical relay chaperone strategy was designed, wherein an alcohol was transiently converted to an imidate radical that underwent intramolecular H-atom transfer (HAT). This regioselective HAT was also rendered enantioselective by harnessing energy transfer catalysis to mediate selective radical generation and interception by a chiral copper catalyst. The successful development of this multi-catalytic, asymmetric, radical C–H amination enabled broad access to chiral β-amino alcohols from a variety of alcohols containing alkyl, allyl, benzyl and propargyl C–H bonds. Mechanistic experiments revealed that triplet energy sensitization of a Cu-bound radical precursor facilitates catalyst-mediated HAT stereoselectivity, enabling the synthesis of several important classes of chiral β-amines by enantioselective, radical C–H amination.

不对称的基本C–H功能化是解决现代综合挑战的罕见但功能强大的工具。特别是，醇的对映体和区域选择性C–H胺化以获取具有医学价值的手性β-氨基醇仍然难以实现。为了解决这一挑战，设计了一种自由基中继分子伴侣策略，其中将一种醇瞬态转化为经过分子内H原子转移（HAT）的亚氨酸酯自由基。通过利用能量转移催化来介导选择性自由基的产生和被手性铜催化剂的拦截，该区域选择性HAT也被赋予了对映选择性。这种多催化，不对称自由基C–H胺的成功开发，使人们能够广泛地从多种含有烷基，烯丙基，苄基和炔丙基C–H键的醇中获得手性β-氨基醇。