Enantiospecific Synthesis of ortho-Substituted Benzylic Boronic Esters by a 1,2-Metalate Rearrangement/1,3-Borotropic Shift Sequence,Journal of the American Chemical Society

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Enantiospecific Synthesis of ortho-Substituted Benzylic Boronic Esters by a 1,2-Metalate Rearrangement/1,3-Borotropic Shift Sequence
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2017-07-06 00:00:00 , DOI: 10.1021/jacs.7b05880
Stefan Aichhorn ₁ , Raphael Bigler ₁ , Eddie L. Myers ₁ , Varinder K. Aggarwal ₁

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Coupling reactions between benzylamines and boronic esters have been investigated. ortho-Lithiated benzylamines react with boronic esters and a N-activator to afford ortho-substituted benzylic boronic esters with formal 1,1′-benzylidene insertion into the C–B bond. The reaction occurs by a S_N2′ elimination and 1,2-metalate rearrangement of the N-activated boronate complex to afford a dearomatized intermediate, which undergoes a Lewis-acid catalyzed 1,3-borotropic shift to afford the boronic ester products in high yield and with excellent enantiospecificity. The use of enantioenriched α-substituted benzylamines gave the corresponding secondary boronic esters with high ee.

中文翻译：

通过1,2-金属重排/ 1,3-硼亲和移位序列对位取代的苄基硼酸酯的对映体合成

已经研究了苄胺和硼酸酯之间的偶联反应。邻-Lithiated苄胺与硼酸酯反应，并且一个Ñ -activator，得到邻位与正规1,1'-亚苄基取代的插入苄硼酸酯到C-B键。该反应通过S _N 2'的消除和N活化的硼酸酯络合物的1,2-金属化物重排而得到脱芳香化的中间体，该中间体经过路易斯酸催化的1,3-硼向转变以得到硼酸酯产物。高收率和优异的对映体特异性。使用富含对映体的α-取代的苄胺得到相应的具有高ee的仲硼酸酯。

更新日期：2017-07-06

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