The Addition of Trimethylsilyl Cyanid to Carbonyl Compounds Using Yb(OTf)<sub>3</sub> as Lewis Acid Catalyst
作者:Yang Yang、Dong Wang
DOI:10.1055/s-1997-1071
日期:——
Yb(OTf)3 was found to be an effective catalyst in the addition of TMSCN to various carbonyl compounds. Highly chemoselective process was observed in the reactions of α-keto aldehyde acetals. Catalyst Yb(OTf)3 is tolerant to the hydroxy group of glyoxylate hydrates used. Catalytic diastereoselective trimethylsilylcyanation of chiral aldehydes and cyanation of glyoxylate hydrates can be carried out under mild condition with moderate de.
Addition of trimethylsilyl cyanide to α-substituted ketones: Catalyst efficiency
作者:W.J. Greenlee、D.G. Hangauer
DOI:10.1016/s0040-4039(00)85954-7
日期:1983.1
Addition of trimethylsilyl cyanide to α-substituted ketones is often slow and incomplete when catalyzed by zinc iodide. Use of potassium cyanide/18-crown-6 complex as catalyst is a superior method, providing high yields of adducts.
Reaction of cyanotrimethylsilane with various carbonyl compounds was effectively catalyzed by Yb(CN)3 to give the adducts in excellent yields; reaction with substituted cyclohexanones proceeded in a highly stereoselective manner.
Catalytic cyanosilylation of ketones with simple phosphonium salt
作者:Xiu Wang、Shi-Kai Tian
DOI:10.1016/j.tetlet.2007.06.132
日期:2007.8
In the presence of 1-5 mot % of benzyltriphenylphosphonium chloride, a wide variety of unconjugated and conjugated, acyclic and cyclic ketones were transformed to their corresponding cyanohydrin silyl ethers in excellent yields. (c) 2007 Elsevier Ltd. All rights reserved.
GREENLEE, W. J.;HANGAUER, D. G., TETRAHEDRON LETT., 1983, 24, N 42, 4559-4560