Synthesis of Xaa-Gly-Xaa′ keto-methylene tri-peptide isosteres incorporating phenylalanine, tyrosine and valine units
摘要:
The utility of amino-acid derived beta-ketosulfones in the synthesis of keto-methylene tri-peptide isosteres Xaa-Gly-Xaa', incorporating phenylalanine, tyrosine and valine units is reported Both L,L and L,D forms of the tripeptide systems have been prepared using this methodology.
Synthesis of Xaa-Gly-Xaa′ keto-methylene tri-peptide isosteres incorporating phenylalanine, tyrosine and valine units
作者:Barry Lygo、Carl N Rudd
DOI:10.1016/0040-4039(95)00564-s
日期:1995.5
The utility of amino-acid derived beta-ketosulfones in the synthesis of keto-methylene tri-peptide isosteres Xaa-Gly-Xaa', incorporating phenylalanine, tyrosine and valine units is reported Both L,L and L,D forms of the tripeptide systems have been prepared using this methodology.
Synthesis of Chiral, Enantiopure Allylic Amines by the Julia Olefination of α-Amino Esters
The four-step conversion of a series of N-Boc-protected l-amino acid methyl esters into enantiopure N-Boc allylamines by a modifiedJuliaolefination is described. Key steps include the reaction of a lithiated phenylalkylsulfone with amino esters, giving chiral β-ketosulfones, and the reductive elimination of related α-acetoxysulfones. The overall transformation takes place under mild conditions, with
描述了通过改进的 Julia 烯化将一系列 N-Boc 保护的 l-氨基酸甲酯转化为对映纯 N-Boc 烯丙胺的四步转化。关键步骤包括锂化苯基烷基砜与氨基酯的反应,产生手性 β-酮砜,以及相关 α-乙酰氧基砜的还原消除。整个转化过程在温和条件下进行,收率良好,且不损失立体化学完整性,在这方面优于 α-氨基醛的常规 Julia 反应。