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。