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Direct synthesis and applications of solid silylzinc reagents
Chemical Science ( IF 7.6 ) Pub Date : 2021-11-30 , DOI: 10.1039/d1sc06038d
Revathi Chandrasekaran 1 , Feba Thomas Pulikkottil 1 , Krishna Suresh Elama 1 , Ramesh Rasappan 1
Affiliation  

The increased synthetic utility of organosilanes has motivated researchers to develop milder and more practical synthetic methods. Silylzinc reagents, which are typically the most functional group tolerant, are notoriously difficult to synthesize because they are obtained by a pyrophoric reaction of silyllithium, particularly Me3SiLi which is itself prepared by the reaction of MeLi and disilane. Furthermore, the dissolved LiCl in silylzinc may have a detrimental effect. A synthetic method that can avoid silyllithium and involves a direct synthesis of silylzinc reagents from silyl halides is arguably the simplest and most economical strategy. We describe, for the first time, the direct synthesis of PhMe2SiZnI and Me3SiZnI reagents by employing a coordinating TMEDA ligand, as well as single crystal XRD structures. Importantly, they can be obtained as solids and stored for longer periods at 4 °C. We also demonstrate their significance in cross-coupling of various free alkyl/aryl/alkenyl carboxylic acids with broader functional group tolerance and API derivatives. The general applicability and efficiency of solid Me3SiZnI are shown in a wide variety of reactions including alkylation, arylation, allylation, 1,4-addition, acylation and more.

中文翻译:

固体硅锌试剂的直接合成及应用

有机硅烷合成用途的增加促使研究人员开发更温和、更实用的合成方法。甲硅烷基锌试剂通常是最耐受官能团的,但其合成非常困难,因为它们是通过甲硅烷基锂的自燃反应获得的,特别是Me 3 SiLi,其本身是通过MeLi和乙硅烷的反应制备的。此外,溶解在甲硅烷基锌中的 LiCl 可能会产生有害影响。一种可以避免使用甲硅烷基锂并涉及从甲硅烷基卤化物直接合成甲硅烷基锌试剂的合成方法可以说是最简单和最经济的策略。我们首次描述了通过使用配位 TMEDA 配体直接合成 PhMe 2 SiZnI 和 Me 3 SiZnI 试剂以及单晶 XRD 结构。重要的是,它们可以固体形式获得,并在 4 °C 下保存更长时间。我们还证明了它们在具有更广泛官能团耐受性的各种游离烷基/芳基/烯基羧酸和 API 衍生物的交叉偶联中的重要性。固体Me 3 SiZnI的一般适用性和效率在多种反应中得到体现,包括烷基化、芳基化、烯丙基化、1,4-加成、酰化等。
更新日期:2021-11-30
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