Enantiospecific Synthesis of
<i>ortho</i>
‐Substituted 1,1‐Diarylalkanes by a 1,2‐Metalate Rearrangement/
<i>anti</i>
‐S
<sub>
<i>N</i>
</sub>
2′ Elimination/Rearomatizing Allylic Suzuki–Miyaura Reaction Sequence
作者:Belén Rubial、Beatrice S. L. Collins、Raphael Bigler、Stefan Aichhorn、Adam Noble、Varinder K. Aggarwal
DOI:10.1002/anie.201811343
日期:2019.1.28
The one‐pot sequential coupling of benzylamines, boronic esters, and aryl iodides has been investigated. In the presence of an N‐activator, the boronate complex formed from an ortho‐lithiated benzylamine and a boronic ester undergoes stereospecific 1,2‐metalate rearrangement/anti‐SN2′ elimination to form a dearomatized tertiary boronic ester. Treatment with an aryl iodide under palladium catalysis
研究了苄胺、硼酸酯和芳基碘化物的一锅顺序偶联。在 N-活化剂存在下,由邻位锂化苄胺和硼酸酯形成的硼酸酯络合物经历立体定向 1,2-金属化物重排/抗 S N 2' 消除,形成脱芳构化叔硼酸酯。在钯催化下用芳基碘化物处理导致 γ-选择性烯丙基 Suzuki-Miyaura 交叉偶联重新芳构化,生成 1,1-二芳基烷烃。当使用对映体富集的 α-取代苄胺时,会形成具有高立体特异性的相应 1,1-二芳基烷烃。