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Nickel Photoredox/Dual-Catalyzed Transfer Semi-Hydrogenation of Alkynes via Aminoalkyl Nickel Species
The Journal of Organic Chemistry ( IF 3.3 ) Pub Date : 2024-12-18 , DOI: 10.1021/acs.joc.4c02071
Kento Nakamura, Kokona Odama, Tomoya Fukuta, Yoshihiro Sato

Using amines in catalytic transfer hydrogenation (TH) is challenging, despite their potential availability as a hydrogen source. Here, we describe a photoredox/nickel-catalyzed TH of alkyne through an intermediary aminoalkyl Ni species. This reaction successfully provided functionalized (Z)-alkenes, such as (homo)allyl ethers, alcohols, and amides (Z/E = up to >99:1), and the reaction thus bypasses a limitation of substrate scope in TH using amine and a Lindlar catalyst. Mechanistic studies revealed that the aminoalkyl Ni species plausibly participates in two catalyst regeneration paths: (1) β-hydride elimination followed by reductive elimination and (2) protodemetalation from alkenyl NiI.

中文翻译:


镍光氧化还原/双催化转移炔烃通过氨基烷基镍种类进行炔烃半氢化反应



在催化转移加氢 (TH) 中使用胺具有挑战性,尽管它们可能作为氢源使用。在这里,我们描述了一种通过中间氨基烷基 Ni 物种的光氧化还原/镍催化的炔烃 TH。该反应成功地提供了官能化 (Z)-烯烃,例如(同)烯丙基醚、醇和酰胺(Z/E = 高达 >99:1),因此使用胺和 Lindlar 催化剂的反应绕过了 TH 中底物范围的限制。机理研究表明,氨基烷基 Ni 物质可能参与了两条催化剂再生途径:(1) β-氢化物消除,然后还原消除和 (2) 烯基镍的质脱金属。
更新日期:2024-12-18
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