Silylations of α,β-unsaturated and aromatic carbonyl compounds with cobalt carbonyls
作者:Attila Sisak
DOI:10.1016/s0022-328x(99)00228-4
日期:1999.7
[η3-η5-(Silyloxy–alkenyl)]-cobalt carbonyls and various silyl ethers were formed in the cobalt carbonyl mediated silylations of α,β-unsaturated and aromaticcarbonylcompounds. A silyloxonium tetracarbonylcobaltate tight ion pair was suggested as a common intermediate, which provides the products through a radical pair in the cases of aromatic aldehydes and ketones.
corresponding Mannich products by various dimethyl(methylene)ammonium salts under a range of reaction conditions. The several methods used to form these derivatives are compared. Excellent approaches to aldehyde derivatives involve treating the enol silyl ether of the carbonyl compound with methyllithium and then an iminium salt, or directly adding the iminium salt to the enol silyl ether. Ketones may be
Palladium-catalyzed reaction of α-bromo ketones with hexabutylditin in the presence of trimethylsilylchloride gave enoltrimethylsilylether in moderate to good yields.
Palladium Catalyzed Reaction of Trimethylsilyltributyltin with α-Halo Ketones. Preparation of Enol Silyl Ethers
作者:Masanori Kosugi、Takao Ohya、Toshihiko Migita
DOI:10.1246/bcsj.56.3539
日期:1983.11
The reaction of trimethylsilyltributyltin with α-halo ketone in the presence of a catalytic amount of palladium chloride plus twice molar amounts of trimethyl phosphite gave enolsilylethers in good yields.
Reactivity of 3,6-dimethoxy-3,6-dimethylcyclohexa-1,4-diene (Part 3). Regioselective α-arylation of ketones via their silyl enol ethers
作者:Francisco Alonso、Miguel Yus
DOI:10.1016/s0040-4020(01)86514-5
日期:1991.11
The reaction of 3,6-dimethoxy-3,6-dimethylcyclohexa-1,4-diene (1) with an excess of different silylenolethers derived from ketones in the presence of zinc dichloride leads to the corresponding ketones regioselectively arylated at the α position.