Ethyl α-Fluoro Silyl Enol Ether: Stereoselective Synthesis and Its Aldol Reaction with Aldehydes and Ketones
作者:Xiao-Ting Huang、Qing-Yun Chen
DOI:10.1021/jo010820+
日期:2002.5.1
Ethyl alpha-fluoro silyl enol ether is stereoselectively synthesized in high yield from inexpensive chlorofluoroacetate and Mg (or Zn) in DMF (or HMPA). Lewis acid promoted aldolreaction of this enol ether with aldehydes and ketones gives alpha-fluoro-beta-hydroxy esters in good to excellent yields.
Mukaiyama–aldol reaction is probably one of the most efficient strategies to prepare synthetically useful β-hydroxy carbonyl compounds. However, only several reported methods were concerned with the accesses to α-fluoro-β-hydroxy esters. Herein, we report a protocol for a fluoride anion-mediated Mukaiyama aldolreaction with low catalytic loading in a short reaction time to incorporate fluorine at the α position