A Divergent Approach to the Diastereoselective Synthesis of 3,3-Disubstituted Oxindoles from Atropisomeric<i>N</i>-Aryl Oxindole Derivatives
作者:Atsuo Nakazaki、Ayako Mori、Susumu Kobayashi、Toshio Nishikawa
DOI:10.1002/asia.201601183
日期:2016.11.22
3,3‐Disubstituted oxindoles were divergently synthesized by diastereoselective transformations including nucleophilic addition, alkylation, and cycloaddition using common, axially chiral N‐aryl oxindoles. Notably, high diastereoselectivities (up to >95:5) were observed with ortho‐monosubstituted N‐aryl oxindoles to give various oxindole scaffolds, and facile removal of the p‐(benzyloxy)aryl moiety
3,3-二取代的羟吲哚是通过非对映选择性转化(包括亲核加成,烷基化和环加成反应)使用常见的轴向手性N-芳基羟吲哚发散合成的。值得注意的是,高非对映选择性(高达> 95:5)与观察到邻位单取代的Ñ -芳基羟吲哚,得到各种羟吲哚骨架,并且容易除去的p - (苄基氧基)芳基部分在轴向扭转的酰胺是由轻度实现,两步序列。