Dual Functionalization of α‐Monoboryl Carbanions through Deoxygenative Enolization with Carboxylic Acids
作者:Wei Sun、Lu Wang、Chungu Xia、Chao Liu
DOI:10.1002/anie.201801679
日期:2018.5.4
1‐diborylalkanes through deoxygenative enolization with carboxylic acids was developed. 1,1‐Diborylalkanes were activated by MeLi to generate α‐monoboryl carbanions. In situ IR spectroscopy indicated an interaction between carboxylic acid and 1,1‐diborylalkane before addition of the activation reagent. Release of the active α‐monoboryl carbanion from the masked form was necessary for its reaction with carboxylate
通过与羧酸的脱氧烯醇化反应,开发了1,1-二硼烷基烷烃的双官能团。MeLi激活1,1-二硼烷基烷烃生成α-单硼烷基碳负离子。原位红外光谱表明,在添加活化剂之前,羧酸和1,1-二硼烷基烷烃之间存在相互作用。从掩蔽形式释放活性α-单硼烷基碳负离子是其与羧酸盐反应以提供烯醇盐类所必需的。用各种亲电试剂对烯醇盐物种进行亲电捕获,实现了1,1-二硼烷基烷烃的双重功能化,从而提供了多种α-单,二和三取代的酮。