Boron trifluoride promoted aldol reaction of silyl ketene acetals with the intermediate generated by the DIBALH reduction of carboxylic acid esters
作者:Syunichi Kiyooka、Masashi Shirouchi
DOI:10.1021/jo00027a001
日期:1992.1
The intermediate generated by the DIBALH reduction of carboxylic acid esters undergoes a boron trifluoride promoted aldol reaction with silyl ketene acetals to afford the corresponding beta-hydroxy carboxylic acids esters in good yield.
hemimalonate used. With the unsubstituted substrate, a carboxylic acid intermediate was isolated upon acid quench resulting from the nucleophilic addition of the putative enol carboxylate anion of the hemimalonate to imines/aldehydes before CO2 loss. With substituted hemimalonates, the reaction likely involved an enolate which then added to imines/aldehydes or was competitively protonated. According to the base