[EN] C(SP3)-C(SP2) CROSS-COUPLING REACTION OF ORGANOZINC REAGENTS AND HETEROCYCLIC (PSEUDO)HALIDES<br/>[FR] RÉACTION DE COUPLAGE CROISÉ C(SP3)-C(SP2) DE RÉACTIFS D'ORGANOZINC ET DE (PSEUDO)HALOGÉNURES HÉTÉROCYCLIQUES
申请人:UNIV HONG KONG SCI & TECH
公开号:WO2018019291A1
公开(公告)日:2018-02-01
Provided is a method of synthesizing a C(sp3)-C(sp2) cross-coupled compound comprising reacting a C(sp3) coupling partner with a C(sp2) coupling partner, a catalyst, and a solvent; wherein the C(sp3) coupling partner comprises an organic zinc reagent; and wherein the C(sp2) coupling partner comprises a heterocyclic halide or a heterocyclic pseudo halide. The method further comprises synthesis of the organic zinc reagent, wherein the synthesis comprises reacting a zinc powder with an acid, filtering, washing, and drying to obtain an activated zinc powder; and reacting the activated zinc powder with a metal iodide catalyst and a second solvent and heating for a predetermined time to obtain the organic zinc reagent.
Ni-Catalyzed Regioselective 1,2-Dialkylation of Alkenes Enabled by the Formation of Two C(sp<sup>3</sup>)–C(sp<sup>3</sup>) Bonds
作者:Roshan K. Dhungana、Rishi R. Sapkota、Laura M. Wickham、Doleshwar Niroula、Ramesh Giri
DOI:10.1021/jacs.0c09778
日期:2020.12.16
We disclose a Ni-catalyzed vicinal difunctionalization of alkenes with benzyl halides and alkylzinc reagents, which produces products with two new alkyl-alkyl bonds. This alkene dialkylation is effective in combining secondary benzyl halides and secondary alkylzinc reagents with internal alkenes, which furnishes products with three contiguous all-carbon secondary stereocenters. The products can be
Correction to “Ni-Catalyzed Regioselective 1,2-Dialkylation of Alkenes Enabled by the Formation of Two C(sp<sup>3</sup>)–C(sp<sup>3</sup>) Bonds”
作者:Roshan K. Dhungana、Rishi R. Sapkota、Laura M. Wickham、Doleshwar Niroula、Ramesh Giri
DOI:10.1021/jacs.1c06574
日期:2021.7.21
The position of the alkene in compound 73 was misplaced. The correct position is 4,5 instead of 3,4. The compound 73 with the correct alkene position and updated spectral data are provided in the corrected Supporting Information. The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/jacs.1c06574. Experimental procedures and characterization data for all compounds
作者:Albert Guijarro、David M. Rosenberg、Reuben D. Rieke
DOI:10.1021/ja9844478
日期:1999.5.1
The oxidative addition of highly reactive zinc to organic bromides shows a pronounced structure−reactivity dependence, in contrast to that shown by other metals. The kinetic and LFER studies suggest a mechanism in which electron transfer (ET) is the rate-determining step of the reaction. Experiments carried out with radical clocks as well as the stereochemical outcome of the reaction support the presence
与其他金属相比,将高活性锌氧化添加到有机溴化物中显示出明显的结构-反应性依赖性。动力学和 LFER 研究表明了一种机制,其中电子转移 (ET) 是反应的速率决定步骤。用自由基时钟进行的实验以及反应的立体化学结果支持自由基的存在。反应性曲线表明 ET 在与烷基溴的反应中具有内球过程的重要组成部分。在芳基卤化物的情况下,哈米特图与芳基卤化物自由基阴离子作为中间体的参与一致。这里考虑的反应可以归结为自由基介导的选择性反应的另一个例子,它具有直接的合成应用。
Diastereoselective Synthesis of the Hydroperoxide–Keto Form of (±)-Steenkrotin B
作者:Jun Xuan、An Zhu、Binjie Ma、Hanfeng Ding
DOI:10.1021/acs.orglett.8b01875
日期:2018.7.6
A diastereoselective approach for the synthesis of the hydroperoxide–keto form of (±)-steenkrotin B (2′) is described. The key features of the strategy involve a Diels–Aldercycloaddition, a titanium(III)-catalyzed reductive annulation, and a regio- and diastereoselective hydroperoxidation.