作者:Wataru Muramatsu、Hiroaki Tsuji、Hisashi Yamamoto
DOI:10.1021/acscatal.7b04244
日期:2018.3.2
A catalytic method for the formation of amide bonds was developed in which the amidation of N-hydroxyimino esters with a broad range of amino acid tert-butyl esters is promoted by a niobium catalyst in the absence of solvent. Contrary to the predominant protocol based on reagent control commonly applied to amidation reactions, this study provides insight into an approach based on substrate control
开发了一种形成酰胺键的催化方法,其中酰胺化具有广泛氨基酸范围的N-羟基亚氨基酯在不存在溶剂的情况下,铌催化剂可促进生成丁酸酯。与通常用于酰胺化反应的基于试剂控制的主要方案相反,本研究为基于底物控制的方法提供了见识。该系统除了具有高原子效率和无外消旋作用外,还以高收率提供了相应的酰胺。该系统的优点在于,在未活化的酯存在下,路易斯酸催化化学选择性地进行。此外,在简单的氢化条件下,所得的酰胺易于以高非对映选择性被转化为其相应的二肽和三肽。