Stereocontrolled Formation of Ketomethylene Isosteres through Tandem Chain Extension Reactions
作者:Weimin Lin、Nancy Tryder、Fan Su、Charles K. Zercher、Jerry P. Jasinski、Ray J. Butcher
DOI:10.1021/jo061184o
日期:2006.10.1
A zinc-mediated chainextension reaction is the key step in the preparation of γ-keto amides derived from amino acids. The use of tandem reaction sequences, in which the intermediate zinc enolate is trapped with electrophilic reagents, results in the incorporation of α-substituents, which mimic the side chains found in natural amino acid systems. Use of the chiral amino acid l-proline as a stereo-directing