Exploiting Continuous Processing for Challenging Diazo Transfer and Telescoped Copper-Catalyzed Asymmetric Transformations
作者:Daniel C. Crowley、Thomas A. Brouder、Aoife M. Kearney、Denis Lynch、Alan Ford、Stuart G. Collins、Anita R. Maguire
DOI:10.1021/acs.joc.1c01310
日期:2021.10.15
Generation and use of triflyl azide in flow enables efficient synthesis of a range of α-diazocarbonyl compounds, including α-diazoketones, α-diazoamides, and an α-diazosulfonyl ester, via both Regitz-type diazo transfer and deacylative/debenzoylative diazo-transfer processes with excellent yields and offers versatility in the solvent employed, in addition to addressing the hazards associated with handling
在流动中生成和使用三氟甲基叠氮化物能够通过 Regitz 型重氮转移和脱酰/脱苯甲酰重氮转移有效合成一系列 α-重氮羰基化合物,包括 α-重氮酮、α-重氮酰胺和 α-重氮磺酰基酯除了解决与处理这种高反应性磺酰叠氮化物相关的危害之外,该工艺还具有出色的收率并提供所用溶剂的多功能性。使用高度对映选择性的铜介导的分子内芳烃加成和 C-H 插入过程伸缩三氟甲基叠氮化物的生成和重氮转移过程表明,可以以足够的纯度获得含有 α-重氮羰基化合物的反应流,以直接通过固定的铜双(恶唑啉)催化剂,而不会不利地影响催化剂的对映选择性。