The well‐defined three coordinated electronically unsaturated cationic organoaluminum complex [((2,6‐iPr2C6H3N)P(Ph2)}2N)AlMe]+[MeB(C6F5)3]− (1), has been utilized to catalyze the cyanosilylation of aldehydes and ketones undermild and solvent‐free conditions. Moreover, catalyst 1 showed high chemoselective cyanosilylation of aldehydes over ketones, nitriles and olefins. The multinuclear NMR investigations
定义明确的三配位电子不饱和阳离子有机铝络合物[[(2,6 - i Pr 2 C 6 H 3 N)P(Ph 2)} 2 N)AlMe] + [MeB(C 6 F 5)3 ] −(1)已用于在温和无溶剂条件下催化醛和酮的氰基硅烷化反应。此外,催化剂1显示醛在酮,腈和烯烃上的高化学选择性氰基硅烷化。该多核NMR调查显示经由之间路易斯加成物形成的是硅氰化反应进行1 然后激活TMSCN(Si-CN键),然后在活化硅烷的Si中心对羰基氧进行亲核攻击并形成产物。
Lewis Acid Rather than Brønsted Acid Sites of Montmorillonite K10 Act as a Powerful and Reusable Green Heterogeneous Catalyst for Rapid Cyanosilylation of Ketones
A practical green protocol was developed for highlyefficientcyanosilylation of various ketonescatalyzed by commercial montmorillonite K10, with excellent isolated yields (91–99%). The catalyst can be used as received, and its catalytic strength can be easily restored without loss of activity. Investigations of catalyst recycling and of the active catalytic sites indicated that Lewis acid sites were
Mild and efficient silylcyanation of ketones catalyzed by cesium fluoride
作者:Sung Soo Kim、Gurusamy Rajagopal、Dae Ho Song
DOI:10.1016/j.jorganchem.2004.01.025
日期:2004.5
An efficientmethod of addition of trimethylsilylcyanide to ketones by employing cesium fluoride as catalyst has been described. A variety of aromatic, aliphatic, cyclic and heterocyclic ketones have been converted into their corresponding trimethylsilyl ethers in excellent yield.
Mild and Efficient Silylcyanation of Ketones Catalyzed by<i>N</i>-Methylmorpholine<i>N</i>-Oxide
作者:Sung Soo Kim、Dong Won Kim、Gurusamy Rajagopal
DOI:10.1055/s-2003-44380
日期:——
An efficientmethod for achiral addition of TMSCN to ketones by employing N-methylmorpholine N-oxide (NMO) alone as the catalyst is described. A variety of aromatic, aliphatic, cyclic and heterocyclic ketones are converted into their corresponding trimethylsilyl ethers in excellent yields (>90%).
Cyanosilylation of Aldehydes and Ketones Catalyzed by Nanocrystalline Magnesium Oxide
作者:M. Lakshmi Kantam、Koosam Mahendar、Bojja Sreedhar、K. Vijay Kumar、B. M. Choudary
DOI:10.1080/00397910802238791
日期:2008.10.28
Abstract Cyanosilylation of various aldehydes and ketones with TMSCN proceeded smoothly under mild conditions to give the corresponding cyanohydrin trimethylsilyl ethers in the presence of nanocrystalline magnesium oxide. The cyanohydrin trimethylsilyl ethers of aldehydes produced cyanohydrins in good to high yields on treatment with 2 N HCl. 29Si NMR spectral evidence proved that the reaction proceeds