Diastereoselective Oxidative Carbon−Carbon Bond Formation via Silyl Bis-enol Ethers
作者:Christopher T. Avetta、Leah C. Konkol、Carla N. Taylor、Karen C. Dugan、Charlotte L. Stern、Regan J. Thomson
DOI:10.1021/ol802516z
日期:2008.12.18
Diisopropylsilyl bis-enol ethers are shown to be powerful intermediates for the diastereoselective dimerization and cross-coupling of cyclic ketones. The trends observed for the oxidative coupling of a range of different dialkylsilyl bis-enol ethers derived from cyclohexanone are rationalized by invoking a stereochemical model based on a Thorpe-Ingold effect.
Enantioselective methylation of the lithium enolate of 1-tetralone mediated by chiral C2-symmetric DMEU derivatives
作者:Katsuyuki Ishii、Shin Aoki、Kenji Koga
DOI:10.1016/s0040-4039(96)02372-6
日期:1997.1
Chiral C2-symmetric DMEU derivatives were designed and synthesized as chiral ligands for lithium. The reaction of the lithiumenolate (2) of 1-tetralone (1) with methyl iodide in toluene in the presence of a DMEU derivative (11) and hexamethyl-disilazane gave (S)-2-methyl-1-tetralone ((S)-3) in up to 92% ee.
Benzotriazole-assisted synthesis of novel mannich bases from ketones and diverse aldehydes
作者:Alan R. Katritzky、Philip A. Harris
DOI:10.1016/s0040-4020(01)81378-8
日期:1990.1
β-amino ketones are prepared in moderate to good yields by the reaction of the lithiumenolates of cyclohexanone, acetophenone, α-tetralone and camphor with the readily available adducts from an aldehyde or ketone, an amine and benzotriazole. Some diastereoselectivity is observed when the benzotriazole adduct is derivedfrom benzaldehyde.
Oxidative Carbon−Carbon Bond Formation via Allyldimethylsilyl Enol Ethers
作者:Leah C. Konkol、Brian T. Jones、Regan J. Thomson
DOI:10.1021/ol902400q
日期:2009.12.3
A method for the oxidative alkylation of ketones through intramolecular allyl-group transfer within preformed allyldimethylsilyl enolethers is reported. A number of examples are detailed, including a study into the effects of resident sterocenters within cyclic enolethers.