Enantioselective Generation and Diastereoselective Reactions of Chiral Enolates Derived from ?-Heterosubstituted Carboxylic Acids. Preliminary Communication
作者:Dieter Seebach、Reto Naef
DOI:10.1002/hlca.19810640829
日期:1981.12.16
Dioxolanones 7 and 8a and oxazolinones 9a derivedfrom pivalaldehyde and lactic acid, mandelic acid, and proline, respectively, furnish chiral enolates of type 3 by deprotonation with LDA. Reactions of these enolates with alkyl halides, aldehydes, and ketones ( 8b, 9b, 11–13) are highly diastereoselective. Thus, the overall enantioselective α-alkylation of chiral, non-racemic α-heterosubstituted carboxylic