Copper-Catalyzed Vinylogous Aerobic Oxidation of Unsaturated Compounds with Air.

Copper-Catalyzed Vinylogous Aerobic Oxidation of Unsaturated Compounds with Air.
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DOI:
10.1021/jacs.8b01886
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发表时间:
2018-04-18
影响因子:
15
通讯作者:
Yin L
Yin L
中科院分区:
化学1区
文献类型:
--
作者:
Zhang HJ;Schuppe AW;Pan ST;Chen JX;Wang BR;Newhouse TR;Yin L

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描述了一种温和且操作简单的铜催化的β,γ-和α,β-不饱和酯的葡萄状有氧氧化。该方法收率高,底物范围广,具有良好的化学选择性和区域选择性以及良好的官能团耐受性。本方法还能氧化β、γ-和α、β-不饱和醛、酮、酰胺、腈和砜。此外,本催化体系适用于双乙烯和三乙烯氧化。四甲基胍(TMG)在其作为碱的作用中被发现是至关重要的,但我们也推测它作为铜(II)三酸酯的配体来产生活性铜(II)催化剂。机理实验表明,通过烯丙基铜(II)的一种合理的反应途径。最后,该方法的范围和力量的广度是通过其应用于复杂的天然产物底物证明。
A mild and operationally simple copper-catalyzed vinylogous aerobic oxidation of β,γ- and α,β-unsaturated esters is described. This method features good yields, broad substrate scope, excellent chemo- and regioselectivity, and good functional group tolerance. This method is additionally capable of oxidizing β,γ- and α,β-unsaturated aldehydes, ketones, amides, nitriles, and sulfones. Furthermore, the present catalytic system is suitable for bisvinylogous and trisvinylogous oxidation. Tetramethylguanidine (TMG) was found to be crucial in its role as a base, but we also speculate that it serves as a ligand to copper(II) triflate to produce the active copper(II) catalyst. Mechanistic experiments conducted suggest a plausible reaction pathway via an allylcopper(II) species. Finally, the breadth of scope and power of this methodology are demonstrated through its application to complex natural product substrates.
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