Stereoselective Synthesis of Acetoacetate-Derived Enol Triflates
作者:David Babinski、Omid Soltani、Doug E. Frantz
DOI:10.1021/ol8010002
日期:2008.7.3
A highly stereoselective method for preparing ( Z)- and ( E)-enol triflates derived from substituted acetoacetate derivatives is described. The salient feature of this methodology is the use of Schotten-Baumann-type conditions to control enolate geometry using either aqueous LiOH ( Z-selective) or aqueous (Me)(4)NOH ( E-selective) in combination with triflic anhydride to provide a practical and predictable