amides to hemiaminal intermediates by TMDS (1,1,3,3-tetramethyldisiloxane) and then the FeCl3-catalyzed nucleophilic addition of the hemiaminal intermediates to phosphonates, which allowed the straightforward synthesis of α-amino phosphonates in moderate to good yields. This method applied well to amides and lactams that bear no strong acidic α-hydrogens, and various functional groups, including methoxy
本文描述了一种简单、温和且高效的连续 KO t Bu/FeCl 3催化的叔酰胺还原膦酰化。该过程首先涉及通过 TMDS(1,1,3,3-四甲基二
硅氧烷)将叔酰胺选择性半还原为
半缩醛胺中间体,然后是 FeCl 3催化将半缩胺醛中间体亲核加成
膦酸酯,其中允许以中等到良好的收率直接合成 α-
氨基膦酸酯。该方法适用于不含强酸性α-氢的酰胺和内酰胺,并且可以耐受各种官能团,包括甲氧基、甲
硫基、
氰基、卤素和杂环。