Elektrokatalytische Cyanomethylierung von Azomethinen: Eine neue Synthese f�r ?-Aminonitrile
摘要:
Certain Schiff-bases (2 - 7) react in acetonitrile (1) at a Hg-cathode in a new electrocatalyzed cyanomethylation method in good yields without side-products to beta-aminonitriles (2a - 7a). The synthesis is initiated by an electrochemical deprotonation of 1 by azomethine-radical anions in catalytical amount to acetonitril anions (B-). During nucleophilic reaction of B- with 2 - 7 up to its complete consumption, the cyanomethylation synthon B- is regenerated in a cyclic, self-reproducing process. Quantum chemical calculation in context with cyanomethylation product analysis permit mechanistical insights and exact prediction of suitable azomethines and coupling position for B-.
Direct Cyanoalkylation of Imines Driven by a Photoactive Electron Donor–Acceptor Complex
作者:Wei Liu、Hao Hou、Haochuan Jing、Shiqing Huang、Wei Ou、Chenliang Su
DOI:10.1021/acs.orglett.4c01673
日期:2024.7.26
β-Amino nitriles are important molecular scaffolds. Cyanoalkylation of imines is the most straightforward method for the construction of these scaffolds. In this study, we report the novel cyanoalkylation of imines via radical coupling enabled by a photoactive electrondonor–acceptorcomplex. This strategy is characterized by mild conditions, broad reaction scopes, and high atom economy. The scalability
β-氨基腈是重要的分子支架。亚胺的氰烷基化是构建这些支架的最直接的方法。在这项研究中,我们报道了通过光敏电子供体-受体复合物实现的自由基偶联实现亚胺的新型氰烷基化。该策略具有条件温和、反应范围广、原子经济性高等特点。该策略的可扩展性和实用性通过 40 g 连续流动系统得到了证明,从中获得了多种重要的药物相关分子。