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 chain extension 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
锌介导的扩链反应是制备衍生自氨基酸的γ-酮酰胺的关键步骤。使用串联反应序列(其中中间烯醇锌被亲电试剂捕获)导致α-取代基的掺入,该取代基模拟天然氨基酸系统中发现的侧链。手性氨基酸1-脯氨酸作为立体定向元件的使用提供了对各种酮亚甲基等排物的非对映选择性的途径。