Generation of Lithium Enolates Accelerated by Lithium Trifluoromethanesulfonate. Application to the Selective 1,4-Chiral Induction in the Aldol Reaction of<i>t</i>-Butyl δ-Hydroxy Carboxylates
The presence of lithium trifluoromethanesulfonate accelerates the enolate formation from t-butyl δ-hydroxy carboxylates with lithium diethylamide. The reaction of the resulting enolates with ketones or benzaldehyde affords the corresponding α,δ-syn aldol adducts stereoselectively.
HIGHLY STEREOSELECTIVE ALKYLATION REACTION OF ESTER ENOLATES GENERATED FROM δ-HYDROXY CARBOXYLIC ACID ESTERS
作者:Koichi Narasaka、Yutaka Ukaji
DOI:10.1246/cl.1986.81
日期:1986.1.5
Alkylation reaction of lithium enolates generated from t-butyl esters of δ-hydroxy carboxylic acids by the treatment with lithiumdiethylamide in THF-HMPA proceeded stereoselectively to afford the corresponding syn-α-alkylated δ-hydroxy esters.