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。
Ate Complexes of Secondary Boronic Esters as Chiral Organometallic-Type Nucleophiles for Asymmetric Synthesis
作者:Robin Larouche-Gauthier、Tim G. Elford、Varinder K. Aggarwal
DOI:10.1021/ja2077813
日期:2011.10.26
The addition of an aryllithium reagent to a secondary boronicester leads to an intermediate boron-ate complex that behaves as a chiral nucleophile, reacting with a broad range of electrophiles with inversion of stereochemistry. Depending on the electrophile, the C-B bond can be converted into C-I, C-Br, C-Cl, C-N, C-O, and C-C, all with very high levels of stereocontrol. This discovery now adds a
Enantiospecific sp2–sp3 coupling of secondary and tertiary boronic esters
作者:Amadeu Bonet、Marcin Odachowski、Daniele Leonori、Stephanie Essafi、Varinder K. Aggarwal
DOI:10.1038/nchem.1971
日期:2014.7
cross-coupling of boronic acids and related derivatives with sp2 electrophiles (the Suzuki–Miyaura reaction) is one of the most powerful C–C bond formation reactions in synthesis, with applications that span pharmaceuticals, agrochemicals and high-tech materials. Despite the breadth of its utility, the scope of this Nobel prize-winning reaction is rather limited when applied to aliphaticboronic esters. Primary