Synthesis of Medium-Sized Carbocycles by Gallium-Catalyzed Tandem Carbonyl-Olefin Metathesis/Transfer Hydrogenation.

Synthesis of Medium-Sized Carbocycles by Gallium-Catalyzed Tandem Carbonyl-Olefin Metathesis/Transfer Hydrogenation.
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镓催化串联羰基-烯烃复分解/转移氢化合成中型碳环。

DOI:
10.26434/chemrxiv.9023879.v1
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发表时间:
2019
期刊:
影响因子:
5.2
通讯作者:
Christophe Bour
Christophe Bour
中科院分区:
化学1区
文献类型:
--
作者:
Alexandre Djurovic;Marie Vayer;Zhilong Li;R. Guillot;J. Baltaze;V. Gandon;Christophe Bour

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描述了涉及闭环羰基-烯烃复分解和转移氢化的催化串联方法的第一实施例。1,4-环己二烯已被用作H2替代物以还原复分解步骤后形成的环烯烃。相同的阳离子镓(III)配合物,[IPr·GaCl 2][SbF 6],执行两个步骤与官能团的耐受性。该立体选择性反应导致1,2-顺式-二取代的环戊烷和各种环己烷。DFT计算支持一个意想不到的机制,涉及超亲电镓(III)二聚体的1,4-环己二烯的活化。
The first examples of a catalytic tandem process involving a ring-closing carbonyl-olefin metathesis and a transfer hydrogenation are described. 1,4-Cyclohexadiene has been used as an H2 surrogate to reduce the cyclic alkenes formed after the metathesis step. The same cationic gallium(III) complex, [IPr·GaCl2][SbF6], performs the two steps with functional group tolerance. This stereoselective reaction leads to 1,2-cis-disubstituted cyclopentanes and various cyclohexanes. DFT computations support an unexpected mechanism involving activation of 1,4-cyclohexadiene by superelectrophilic gallium(III) dimers.
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