Ligand-Controlled Chemoselective C(acyl)-O bond vs. C(aryl)-C bond Activation of Aromatic Esters in Nickel Catalyzed C(sp2)-C(sp3) Cross-Couplings,Journal of the American Chemical Society

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Ligand-Controlled Chemoselective C(acyl)-O bond vs. C(aryl)-C bond Activation of Aromatic Esters in Nickel Catalyzed C(sp2)-C(sp3) Cross-Couplings
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2018-02-20 , DOI: 10.1021/jacs.7b12865
Adisak Chatupheeraphat ₁ , Hsuan-Hung Liao ₁ , Watchara Srimontree ₁ , Lin Guo ₁ , Yury Minenkov ₂ , Albert Poater _{2,

3} , Luigi Cavallo ₂ , Magnus Rueping _{1,

2}

Affiliation

A ligand-controlled and site-selective nickel catalyzed Suzuki-Miyaura cross-coupling reaction with aromatic esters and alkyl organoboron reagents as coupling partners was developed. This methodology provides a facile route for C(sp2)-C(sp3) bond formation in a straightforward fashion by successful suppression of the undesired β-hydride elimination process. By simply switching the phosphorus ligand, the ester substrates are converted into the alkylated arenes and ketone products, respectively. The utility of this newly developed protocol was demonstrated by its wide substrate scope, broad functional group tolerance and application in the synthesis of key intermediates for the synthesis of bioactive compounds. DFT studies on the oxidative addition step helped rationalizing this intriguing reaction chemoselectivity: whereas nickel complexes with bidentate ligands favor the C(aryl)-C bond cleavage in the oxidative addition step leading to the alkylated product via a decarbonylative process, nickel complexes with monodentate phosphorus ligands favor activation of the C(acyl)-O bond, which later generates the ketone product.

中文翻译：

镍催化的 C(sp2)-C(sp3) 交叉偶联中芳香酯的配体控制化学选择性 C(酰基)-O 键与 C(芳基)-C 键的活化

开发了一种配体控制和位点选择性镍催化的 Suzuki-Miyaura 交叉偶联反应，以芳香酯和烷基有机硼试剂作为偶联伙伴。该方法通过成功抑制不需要的 β-氢化物消除过程，以直接的方式为 C(sp2)-C(sp3) 键的形成提供了一条简便的途径。通过简单地切换磷配体，酯底物分别转化为烷基化芳烃和酮产物。这种新开发的协议的实用性体现在其广泛的底物范围、广泛的官能团耐受性和在合成生物活性化合物的关键中间体的合成中的应用。对氧化加成步骤的 DFT 研究有助于合理化这种有趣的反应化学选择性：

更新日期：2018-02-20

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