作者:Konstantin V. Kudryavtsev、Mikhail Yu. Tsentalovich、Anton S. Yegorov、Eugene L. Kolychev
DOI:10.1002/jhet.5570430608
日期:2006.11
Azomethine ylides have been generated from aromatic aldimines of α-amino acid methyl esters under treatment with LiBr/Et3N and trapped with tert-butyl acrylate yielding racemic orthogonally protected cis-5-arylpyrrolidine-2,4-dicarboxylates regio- and stereo-selectively in high yields. Subsequent N-methylation and deprotection of 4-carboxylic group of cycloaddition products led to novel prolineglutamate
在用LiBr / Et 3 N处理的情况下,由α-氨基酸甲酯的芳香亚胺形成了甲亚胺基化物,并用丙烯酸叔丁酯捕获,得到外消旋的,正交保护的顺式-5-芳基吡咯烷-2,4-二羧酸酯,区域和立体选择性地高产。随后的环加成产物的4-羧基的N-甲基化和脱保护导致了在吡咯烷支架的2和5位具有取代基的新型脯氨酸谷氨酸顺式嵌合体。