Department of Chemistry, Rice University, BioScience Research Collaborative, Houston, Texas 77005, USA.
Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, USA.
Nat Chem. 2017 Jul;9(7):681-688. doi: 10.1038/nchem.2672. Epub 2016 Nov 28.
Arylmetals are highly valuable carbon nucleophiles that are readily and inexpensively prepared from aryl halides or arenes and widely used on both laboratory and industrial scales to react directly with a wide range of electrophiles. Although C-C bond formation has been a staple of organic synthesis, the direct transfer of primary amino (-NH) and hydroxyl (-OH) groups to arylmetals in a scalable and environmentally friendly fashion remains a formidable synthetic challenge because of the absence of suitable heteroatom-transfer reagents. Here, we demonstrate the use of bench-stable N-H and N-alkyl oxaziridines derived from readily available terpenoid scaffolds as efficient multifunctional reagents for the direct primary amination and hydroxylation of structurally diverse aryl- and heteroarylmetals. This practical and scalable method provides one-step synthetic access to primary anilines and phenols at low temperature and avoids the use of transition-metal catalysts, ligands and additives, nitrogen-protecting groups, excess reagents and harsh workup conditions.
芳基金属是非常有价值的碳亲核试剂,可通过芳基卤化物或芳烃轻松且廉价地制备,广泛用于实验室和工业规模,直接与多种亲电试剂反应。尽管 C-C 键形成一直是有机合成的主要内容,但由于缺乏合适的杂原子转移试剂,以可扩展且环保的方式将伯氨基(-NH)和羟基(-OH)基团直接转移到芳基金属上仍然是一项艰巨的合成挑战。在这里,我们证明了使用来自易得萜烯骨架的稳定的 N-H 和 N-烷基恶唑啉作为有效多功能试剂,可直接对结构多样的芳基和杂芳基金属进行伯胺化和羟化反应。这种实用且可扩展的方法可在低温下一步合成伯苯胺和苯酚,避免使用过渡金属催化剂、配体和添加剂、氮保护基团、过量试剂和苛刻的后处理条件。