A series of α-substituted amides 3 and 7–9 has been synthesized in enantiomerically pure form by diastereoselective alkylation of N-alkyl phenylglycinol amides 2 and 4–6 respectively. A rigid amide enolate has been postulated to explain the observed diastereoselectivity.
Enantioselective Synthesis of β-Substituted Primary and Secondary Amines by Alkylation of (R)-Phenylglycinol Amide Enolates
作者:Valérie Jullian
DOI:10.1055/s-1997-1303
日期:1997.9
General and convenient syntheses of optically active β-substituted secondary or primary amines 4 and 8 are described. The method is based on diastereoselective alkylation of amides 1 and 5 derived from R-(-)-phenylglycinol followed by reduction and removal of the chiral appendage. This procedure has also been applied to the preparation of 1,4-amino alcohols 12 and γ-amino esters 14.