A Highly Efficient Gold-Catalyzed Photoredox α-C(sp<sup>3</sup>)H Alkynylation of Tertiary Aliphatic Amines with Sunlight
作者:Jin Xie、Shuai Shi、Tuo Zhang、Nina Mehrkens、Matthias Rudolph、A. Stephen K. Hashmi
DOI:10.1002/anie.201412399
日期:2015.5.11
A new α‐C(sp3)H alkynylation of unactivated tertiaryaliphaticamines with 1‐iodoalkynes as radical alkynylating reagents in the presence of [Au2(μ‐dppm)2]2+ in sunlight provides propargylic amines. Based on mechanistic studies, a CC coupling of an α‐aminoalkyl radical and an alkynyl radical is proposed for the C(sp3)C(sp) bond formation. The mild, convenient, efficient, and highly selective C(sp3)H
catalyst (Au/NiFe-LDH) for efficient electrocatalytic C-C coupling reaction in direct C(sp3)-H alkynylation of tertiary aliphatic amines with 1-iodoalkynes, which is coupled with H2 production. Specifically, triethylamine and 1-iodoalkynes undergo efficient alkynylation to afford propargylamine in high yield (79%) and recycling ability without addition of external oxidants, coupling with 78-fold higher H2
将阴极 H 2生产与有机化合物的电合成相结合不仅解决了缓慢的析氧反应 (OER) 动力学问题,而且还产生了有价值的化学品。然而,这种策略很少被探索用于直接和选择性的 C(sp 3 )-H 活化以构建 CC 键,这可以显着提高有机合成中的合成效率。在这里,我们报道了一种镍铁层状双氢氧化物负载的金催化剂 (Au/NiFe-LDH),用于在脂肪叔胺与 1-碘代炔烃的直接 C(sp 3 )-H 炔基化中进行高效的电催化 CC 偶联反应,该催化剂偶联与 H 2生产。具体来说,三乙胺和 1-碘代炔烃经过有效的炔基化反应,可在不添加外部氧化剂的情况下以高产率 (79%) 和回收能力提供炔丙胺,与相同电位下的水分解相比, H 2产率提高了 78 倍。这项工作可能会揭示在温和条件下 OER 取代反应对 CC 键形成反应的影响。