The Aldol Reaction of Silyl Enol Ethers with Aldehydes in Aqueous Media
作者:Shū Kobayashi、Iwao Hachiya
DOI:10.1016/s0040-4039(00)91691-5
日期:1992.3
The aldol reaction of silyl enol ethers with aldehydes is successfully carried out in aqueous media by using a lanthanide trifluoromethanesulfonate as a catalyst. Water soluble aldehydes are applicable and the catalyst can be recovered and reused in this reaction.
Lanthanide Triflates as Water-Tolerant Lewis Acids. Activation of Commercial Formaldehyde Solution and Use in the Aldol Reaction of Silyl Enol Ethers with Aldehydes in Aqueous Media
作者:Shu Kobayashi、Iwao Hachiya
DOI:10.1021/jo00092a017
日期:1994.7
Lanthanide trifluoromethanesulfonates (triflates), especially ytterbium triflate (Yb(OTf)(3)), were found to be stable Lewis acids in water. In the presence of a catalytic amount of lanthanide triflate, formaldehyde in water solution (commercial formaldehyde solution) was activated and the hydroxymethylation reaction of silyl enol ethers proceeded smoothly. Lanthanide triflates were also quite effective in the aldol reaction of silyl enol ethers with aldehydes in aqueous media, and water-soluble aldehydes such as acetaldehyde, acrolein, and chloroacetaldehyde could be employed for direct use. Moreover, in all these reactions, lanthanide triflates were quantitatively recovered after the reactions were completed and could be reused.
Kobayashi; Hashiya; Ishitani, Russian Journal of Organic Chemistry, 1996, vol. 32, # 2, p. 193 - 202
作者:Kobayashi、Hashiya、Ishitani、Moriwaki、Nagayama
DOI:——
日期:——
Enesulfonamides as Nucleophiles in Catalytic Asymmetric Reactions