Beyond Hydrofunctionalisation: A Well-Defined Calcium Compound Catalysed Mild and Efficient Carbonyl Cyanosilylation
作者:Sandeep Yadav、Ruchi Dixit、Kumar Vanka、Sakya S. Sen
DOI:10.1002/chem.201705795
日期:2018.1.26
Organocalciumcompounds have been reported as efficient catalysts for various transformations, for cases in which one of the substrates contained an E−H (E=B, N, Si, P) bond. Here, we look at the possibility of employing an organocalciumcompound for a transformation in which none of the precursors has a polar E−H bond. This study demonstrates the utilization of a well‐defined amidinatocalcium iodide
Low-valent magnesium(<scp>i</scp>)-catalyzed cyanosilylation of ketones
作者:Weifan Wang、Man Luo、Jia Li、Sumod A. Pullarkat、Mengtao Ma
DOI:10.1039/c8cc00826d
日期:——
The magnesium(I) complex [(XylNacnac)Mg]2 was employed as a highly efficient catalyst for the cyanosilylation of a variety of ketones with trimethylsilyl cyanide under mild conditions. In contrast to the traditional stoichiometric use of magnesium(I) complexes, 1 provides the first example of a truly catalytic application of Mg(I) complexes.
Asymmetric Cyanation of Aldehydes, Ketones, Aldimines, and Ketimines Catalyzed by a Versatile Catalyst Generated from Cinchona Alkaloid, Achiral Substituted 2,2′-Biphenol and Tetraisopropyl Titanate
Full investigation of cyanation of aldehydes, ketones, aldimines and ketimines with trimethylsilyl cyanide (TMSCN) or ethyl cyanoformate (CNCOOEt) as the cyanide source has been accomplished by employing an in situ generated catalyst from cinchona alkaloid, tetraisopropyl titanate [Ti(OiPr)4] and an achiral modified biphenol. With TMSCN as the cyanide source, good to excellent results have been achieved
Addition of trimethylsilyl cyanide to aromatic ketones promoted by organic solutions of lithium salts
作者:Gérard Jenner
DOI:10.1016/s0040-4039(98)02419-8
日期:1999.1
Cyanosilylation of aromatic ketones is strongly promoted in organic solutions of specific lithiumsalts (perchlorate and tetrafluoroborate). Acetonitrile solutions of LiBF4 are safe and efficient media for this reaction.
A highlyefficient cyanosilylation protocol mediated by the easily available n-BuLi with a wide range of aldehydes and ketones was developed. This protocol features excellent yields with very low n-BuLi loadings (0.01–0.05 mol%) at room temperature, solvent-free process, good chemo-/regio-selectivity and functional group tolerance and scalability. A possible reaction pathway based upon stoichiometric