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
Chemoselective aldol condensation in 5 mol dm−3 lithium perchlorate–nitromethane. A comparison with lithium perchlorate–diethyl ether medium
作者:R. Sudha、S. Sankararaman
DOI:10.1039/a900095j
日期:——
Aldol reactions of silyl enol ethers with aldehydes proceed in 5 mol dm–3 lithium perchlorate–nitromethane medium at ambient temperature. The reaction is highly chemoselective such that only aldehydes and cyclic ketones reacted while acyclic and aromatic ketones failed to react. The same reaction is not promoted in 5 mol dm–3 lithiumperchlorate–diethylether medium. The difference between these two
Lewis Acid Catalyst Free Electrophilic Alkylation of Silicon-Capped π Donors in 1,1,1,3,3,3-Hexafluoro-2-propanol
作者:Maxim O. Ratnikov、Vasily V. Tumanov、William A. Smit
DOI:10.1002/anie.200803927
日期:2008.12.1
New Bis(imino)pyridine Complexes of Iron(II) and Iron(III), and Their Catalytic Activity in the Mukaiyama Aldol Reaction
作者:Eike Bauer、Pushkar Shejwalkar、Nigam Rath
DOI:10.1055/s-0033-1340081
日期:——
ratios of the products was investigated. New iron(II) and iron(III) complexes bearing bis(imino)pyridine ligands were synthesized and successfully applied to the Mukaiyama aldol reaction. The two complexes [FeCl2 L] (L = bis(imino)pyridine ligand, 55% isolated yield) and [LFe(μCl)3FeCl3] (76%) were obtained employing FeCl2 and FeCl3 iron sources, respectively, and characterized by elemental analyses, mass