Cyanotrimethylsilane adds to some ⇌,β-unsaturated ketones in conjugate manner under the catalytic action of Lewis acids such as triethylaluminium, aluminiumchloride, and SnCl2. Hydrolysis of the products gives β-cyano ketones which are identical to the hydrocyanated products of the starting enones. The title silicon reagent reacts with acetals and orthoesters under the catalytic action of SnCI2 or BF3-OEt2
Electrogenerated Acid-Catalyzed Reactions of Acetals, Aldehydes, and Ketones with Organosilicon Compounds, Leading to Aldol Reactions, Allylations, Cyanations, and Hydride Additions
electrogenerated acid (EG acid) in the silicon-mediated acid-catalyzed reactions; e.g., aldol reactions, allylations, cyanations, and hydride additions is described. The aldol reaction of acetals 1 with enol trimethylsilyl ethers 3 and 1,2-bis(trimethylsiloxy)alkenes 4 gives the corresponding adducts 5 and 6, respectively. The reaction proceeds smoothly with EG acid derived from perchlorate salts such
ELECTROGENERATED ACID AS AN EFFICIENT CATALYST FOR CYANATION OF ACETALS WITH TRIMETHYLSILYL CYANIDE
作者:Sigeru Torii、Tsutomu Inokuchi、Tohru Kobayashi
DOI:10.1246/cl.1984.897
日期:1984.6.5
A facile cyanation of acetals with trimethylsilyl cyanide, giving the corresponding α-alkoxyalkanenitriles, is achieved by using an electrogenerated acid as an acid-catalyst.
作者:Mikkel V. DeBenedetto、Michael E. Green、Shuangyi Wan、Jung-Hyun Park、Paul E. Floreancig
DOI:10.1021/ol802764j
日期:2009.2.19
alpha-Branched amides are prepared by multicomponent reactions in which nitriles undergo hydrozirconation to form metalloimines that react with acyl chlorides. The resulting acylimines react with a variety of pi-nucleophiles in the presence of Lewis acids to form the desired amides.
2-alkoxy and 2,2-dialkoxy nitriles from acetals and orthoesters — exchange of alkoxy into cyano group by means of cyanotrimethylsilane