Zinc-Catalyzed Chemoselective Reduction of Nitriles to N-Silylimines through Hydrosilylation: Insights into the Reaction Mechanism
作者:Rajata Kumar Sahoo、Sharanappa Nembenna
DOI:10.1021/acs.inorgchem.3c00309
日期:2023.8.7
the C≡N bond of nitrile into Zn–H to form the zinc vinylidenamido complexes (Zn-1′ and Zn-2′). The active catalysts Zn-1′ and Zn-2′ are confirmed by NMR, mass spectrometry, and single-crystal X-ray diffraction analyses. A most plausible catalytic cycle has been explored depending on stoichiometric experiments, active catalysts isolation, and in situ studies. Moreover, the synthetic utility of this
N ,N' -螯合共轭双胍 (CBG) 支持的氢化锌 ( Zn-1 ) 预催化了各种腈类的极具挑战性的化学选择性单氢化硅烷化反应,生成独特的 N-甲硅烷基亚胺和/或N,N' -报道了甲硅烷基二亚胺。此外,将预催化剂Zn-1的有效性与另一种预催化剂类似物,即二乙基NacNac氢化锌( Zn-2 )进行比较,以了解配体效应。我们观察到预催化剂Zn-1在将腈还原为 N-甲硅烷基亚胺方面表现出比预催化剂Zn-2更高的效率和更好的选择性。机理研究表明,腈的 C=N 键插入 Zn-H 中,形成亚乙烯基锌复合物(Zn-1'和Zn-2')。通过NMR、质谱和单晶X射线衍射分析证实了活性催化剂Zn-1'和Zn-2' 。根据化学计量实验、活性催化剂分离和原位研究,已经探索了最合理的催化循环。此外,还证明了该协议的合成效用。