4.5 Article

Preparation of Vinylic Lithium Reagents from Silyl Enolates of Alkyl Aryl Ketones Using Lithium Arenide

Journal

ASIAN JOURNAL OF ORGANIC CHEMISTRY
Volume -, Issue -, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/ajoc.202300242

Keywords

alkenyllithium; organolithium; silyl enolate; lithiation; reduction

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The preparation of vinylic lithium reagents from vinylic halides is common in organic synthesis, but not always easy. This study proposes a new method using silyl enolates of alkyl aryl ketones, which provides readily available and efficient vinylic lithium species. The reductive transformation of electron-rich silyl enolates has significant potential for various applications in organic synthesis, serving as an alternative to the Shapiro reaction.
The preparation of vinylic lithium reagents from vinylic halides is a common practice in organic synthesis. However, the preparation of vinylic halides is not always straightforward. In this study, we propose the use of silyl enolates of alkyl aryl ketones as a readily available and efficient alternative for generating vinylic lithium species. Treatment of triisopropylsilyl enolates of alkyl aryl ketones with lithium naphthalenide or lithium 4,4'-di-t-butylbiphenylide affords the corresponding vinylic lithium species. This preparation represents a reductive transformation of electron-rich silyl enolates, which had remained unexplored. This process provides an alternative to the Shapiro reaction and has great potential for various applications in organic synthesis.

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