作者:Matthew W. Leighty、Bo Shen、Jeffrey N. Johnston
DOI:10.1021/ja306225u
日期:2012.9.19
synthesis using a sequence beginning with a Henry addition of bromonitromethane to aldehydes and finishing with Umpolung Amide Synthesis (UmAS). Key to high enantioselection is the finding that ortho-iodo benzoic acid salts of the chiral copper(II) bis(oxazoline) catalyst deliver both diastereomers of the Henry adduct with high enantiomeric excess, homochiral at the oxygen-bearing carbon. Overall, this approach
α-氧酰胺是通过对映选择性合成制备的,使用的序列从溴硝基甲烷与醛的亨利加成开始,最后是 Umpolung 酰胺合成 (UmAS)。高对映体选择的关键是发现手性铜 (II) 双(恶唑啉) 催化剂的邻碘苯甲酸盐提供亨利加合物的两种非对映异构体,对映体过量,在含氧碳上同手性。总体而言,这种 α-氧基酰胺方法为几乎完全专注于 α-氧基羧酸的对映选择性合成的替代品提供了创新的补充。