A route to stereochemically pure benzyllithium reagents by stereocontrolled epimerisation.

A route to stereochemically pure benzyllithium reagents by stereocontrolled epimerisation.
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通过立体控制差向异构化获得立体化学纯的苄基锂试剂的途径

DOI:
10.1002/chem.201405152
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
C. Strohmann
C. Strohmann
中科院分区:
--
文献类型:
--
作者:
S.G. Koller;U. Kroesen;C. Strohmann

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烷基锂化合物通常在室温下不稳定,因此建立了克服这种限制的策略。我们提出了一个系统的方法,以获得立体化学富集的苄基锂化合物,开始与简单的添加手性助剂和结束的辅助纳入在基板中。由此,获得了锂化苄基硅烷的非常不寻常的二聚体,其可以通过加入刘易斯碱分裂成立体化学富集的单体。此外,我们能够理解的因素,负责这种立体化学富集,通过使用量子化学计算和澄清的锂化化合物和相应的捕获产品的结晶的配置。这使我们能够确定去质子化和随后的复分解反应的立体化学过程。
Alkyllithium compounds are not generally stable at room temperature, therefore strategies were established to overcome this limitation. We present a systematic approach to obtain a stereochemically enriched benzyllithium compound, starting with the simple addition of a chiral auxiliary and ending by incorporation of the auxiliary in the substrate. Thereby, a very unusual dimer of a lithiated benzylsilane was obtained, which could be split into stereochemically enriched monomers by the addition of Lewis bases. Furthermore, we were able to understand the factors responsible for this stereochemical enrichment by using quantum chemical calculations and clarify the configuration of the lithiated compound and the corresponding trapping product by crystallisation. This enabled us to determine the stereochemical course of the deprotonation and the subsequent metathesis reaction.
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