β-Alkoxy ketones are synthesized in good yields by the reaction of alkyl enol ethers with acetals in the presence of a catalytic amount of tritylsalts. Of enol ethers, methoxymethyl (MOM) enol ether exhibits an enhanced reactivity as a nucleophile.
Novel reactive silyl enolates. Highly stereoselective aldol and Michael reactions without catalysts
作者:Shu Kobayashi、Koichi Nishio
DOI:10.1021/jo00062a002
日期:1993.5
Novel silyl enolates, prepared in situ from ketones and dimethylsilyl ditriflate (Me2Si(OTf)2) in the presence of a tertiary amine, reacted smoothly with electrophiles such as aldehydes, acetals, or alpha,beta-unsaturated ketones without catalyst at -78-degrees-C to afford the corresponding adducts in high yields and with high selectivities.