Unexpected selectivity in ruthenium-catalyzed hydrosilylation of primary amides: synthesis of secondary amines
作者:Bin Li、Jean-Baptiste Sortais、Christophe Darcel
DOI:10.1039/c3cc39149c
日期:——
Selectiveruthenium-catalyzed reductive coupling of primary amides under hydrosilylation conditions is achieved using an one pot procedure. Using 3 equiv. of phenylsilane and [RuCl2(mesitylene)]2 (1-2 mol%) as the catalyst at 100 degrees C under neat conditions, secondary symmetric amines were obtained in good yields and with high chemoselectivities.
Mild and Selective Cobalt‐Catalyzed Chemodivergent Transfer Hydrogenation of Nitriles
作者:Zhihui Shao、Shaomin Fu、Mufeng Wei、Shaolin Zhou、Qiang Liu
DOI:10.1002/anie.201608345
日期:2016.11.14
Herein, we describe a selective cobalt‐catalyzed chemodivergent transferhydrogenation of nitriles to synthesize primary, secondary, and tertiary amines. The solvent effect plays a key role for the selectivity control. The general applicability of this procedure was highlighted by the synthesis of more than 70 amine products bearing various functional groups in high chemoselectivity. Moreover, this
syntheses of secondary and tertiaryamines by highlyefficientdirect N‐alkylation of primary and secondaryamines with alcohols or by deaminative self‐coupling of primary amines have been successfully realized by means of a heterogeneous bimetallic Pt–Sn/γ‐Al2O3 catalyst (0.5 wt % Pt, Pt/Sn molar ratio=1:3) through a borrowing‐hydrogen strategy. In the presence of oxygen, imines were also efficiently prepared
Active and Recyclable Catalytic Synthesis of Indoles by Reductive Cyclization of 2-(2-Nitroaryl)acetonitriles in the Presence of Co–Rh Heterobimetallic Nanoparticles with Atmospheric Hydrogen under Mild Conditions
作者:Isaac Choi、Hyunho Chung、Jang Won Park、Young Keun Chung
DOI:10.1021/acs.orglett.6b02659
日期:2016.11.4
cobalt–rhodium heterobimetallic nanoparticle-catalyzed reductive cyclization of 2-(2-nitroaryl)acetonitriles to indoles has been achieved. The tandem reaction proceeds without any additives under the mild conditions (1 atm H2 and 25 °C). This procedure could be scaled up to the gram scale. The catalytic system is significantly stable under these reaction conditions and could be reused more than ten times without
钴-铑异双金属纳米粒子催化的2-(2-硝基芳基)乙腈还原环化成吲哚。在温和条件下(1 atm H 2和25°C),串联反应在没有任何添加剂的情况下进行。该过程可以按比例放大至克级。在这些反应条件下,催化体系非常稳定,可以重复使用十次以上,而不会损失催化活性。
Surface modification boosts exciton extraction in confined layered structure for selective oxidation reaction
directional transfer of charge carriers are impracticable for extracting bulk excitons. To this issue, we here propose that the extraction of bulk exciton could be effectively implemented by surface modification. By taking confined layered bismuth oxycarbonate (Bi2O2CO3) as an example, we highlight that the incorporation of iodine atoms on the surface could modify the micro-region electronic structure and
从本体到表面提取光生物质是获得高效半导体光催化的重要过程。然而,与带电光生载流子相比,中性激子对电场的响应可以忽略不计。因此,涉及用于促进电荷载流子定向转移的带对齐构造的传统策略对于提取体激子是不切实际的。针对这个问题,我们在这里提出通过表面改性可以有效地实现体激子的提取。通过取密闭层状碳酸铋(Bi 2 O 2 CO 3) 作为一个例子,我们强调碘原子在表面的结合可以改变微区电子结构,从而导致表面激子态的能量降低。受益于本体激子态和表面激子态之间的能量梯度,碘修饰的 Bi 2 O 2 CO 3具有高效的本体激子提取,因此在触发1 O 2介导的选择性氧化反应方面表现出提升的性能。这项工作展示了表面改性在调节半导体基光催化剂的激子过程中的积极作用。