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手性和区域选择性镍催化硅基导向的烯丙基亲电试剂的 C(sp )-C(sp ) 交叉偶联反应。

Enantio- and Regioconvergent Nickel-Catalyzed C(sp )-C(sp ) Cross-Coupling of Allylic Electrophiles Steered by a Silyl Group.

机构信息

Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623, Berlin, Germany.

出版信息

Angew Chem Int Ed Engl. 2021 Jun 7;60(24):13652-13655. doi: 10.1002/anie.202102233. Epub 2021 May 5.

DOI:10.1002/anie.202102233
PMID:33822445
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8251714/
Abstract

A two-step sequence for the enantio- and diastereoselective synthesis of exclusively alkyl-substituted acyclic allylic systems with a stereocenter in the allylic position is reported. The asymmetric induction and the site selectivity are controlled in an enantio- and regioconvergent nickel-catalyzed C(sp )-C(sp ) cross-coupling of regioisomeric mixtures of racemic α-/γ-silylated allylic halides and primary alkylzinc reagents. The silyl group steers the allylic displacement towards the formation of the vinylsilane regioisomer, and the resulting C(sp )-Si bond serves as a linchpin for the installation of various C(sp ) substituents in a subsequent step.

摘要

本文报道了一种通过两步序列,对具有手性中心的非环烯丙基体系进行对映选择性和非对映选择性合成的方法,其中烯丙位具有烷基取代基。通过对映和区域收敛的镍催化的区域异构混合物的外消旋α-/γ-硅基化烯丙基卤化物和一级烷基锌试剂的 C(sp 3 )-C(sp 3 )交叉偶联反应,控制不对称诱导和位点选择性。硅基导向烯丙基取代反应形成乙烯基硅烷区域异构体,得到的 C(sp 3 )-Si 键在后续步骤中作为安装各种 C(sp 3 )取代基的关键。

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