Reductive Decarboxylative Alkynylation of
<i>N</i>
‐Hydroxyphthalimide Esters with Bromoalkynes
作者:Liangbin Huang、Astrid M. Olivares、Daniel J. Weix
DOI:10.1002/anie.201706781
日期:2017.9.18
A new method for the synthesis of terminal and internal alkynes from the nickel‐catalyzed decarboxylative coupling of N‐hydroxyphthalimide esters and bromoalkynes is presented. This reductive cross‐electrophile coupling is the first to use a C(sp)−X electrophile, and appears to proceed via an alkynylnickel intermediate. The internal alkyne products are obtained in yields of 41–95 % without the need
提出了一种通过镍催化 N-羟基邻苯二甲酰亚胺酯和溴代炔的脱羧偶联合成末端和内部炔烃的新方法。这种还原性交叉亲电试剂偶联首次使用 C(sp)−X 亲电试剂,并且似乎是通过炔基镍中间体进行的。无需光催化剂、光或强氧化剂即可获得内部炔烃产物,收率为 41-95%。该反应显示出广泛的羧酸和炔烃偶联伙伴,并且可以耐受一系列官能团,包括氨基甲酸酯NH、卤素、腈、烯烃、酮和酯部分。机理研究表明,该过程不涉及炔基锰试剂,而是通过镍介导的键形成进行。