Iterative addition of carbon nucleophiles to <i>N</i>,<i>N</i>-dialkyl carboxamides for synthesis of α-tertiary amines
作者:Jiahua Chen、Jun Wei Lim、Derek Yiren Ong、Shunsuke Chiba
DOI:10.1039/d1sc05876b
日期:——
A protocol for the synthesis of α-tertiary amines was developed by iterative addition of carbon nucleophiles to N,N-dialkyl carboxamides. Nucleophilic 1,2-addition of organolithium reagents to carboxamides forms anionic tetrahedral carbinolamine (hemiaminal) intermediates, which are subsequently treated with bromotrimethylsilane (Me3SiBr) followed by organomagnesium (Grignard) reagents, organolithium
通过将碳亲核试剂反复添加到N , N-二烷基甲酰胺中,开发了一种合成 α-叔胺的方案。有机锂试剂与羧酰胺的亲核 1,2-加成形成阴离子四面体甲醇胺(半胺)中间体,随后用溴三甲基硅烷 (Me 3 SiBr) 处理,然后用有机镁(格氏)试剂、有机锂试剂或氰化四丁基铵,得到 α-叔胺. 使用(三甲基甲硅烷基)甲基溴化镁作为第 2种亲核试剂,可以通过酸性后处理将所得的 α-叔(三甲基甲硅烷基)甲基胺进行 aza-Peterson 烯化,从而形成 1,1-二芳基乙烯。