bimetallic and trimetallic "coordination booster-catalyst" assemblies in which the coordination complexes [RuII (terpy)2 ] and [OsII (terpy)2 ] acted as boosters for enhancement of the catalytic activity of [RuII (NHC)(para-cymene)]-based catalytic site. The boosters accelerated the oxidative loss of para-cymene from the catalytic site to generate the active catalyst during the oxidation of alkenes and alkynes
Boryl Radicals Enabled a Three-Step Sequence to Assemble All-Carbon Quaternary Centers from Activated Trichloromethyl Groups
作者:Qiang Zhao、Bin Li、Xi Zhou、Zhao Wang、Feng-Lian Zhang、Yuanming Li、Xiaoguo Zhou、Yao Fu、Yi-Feng Wang
DOI:10.1021/jacs.2c05798
日期:2022.8.24
the three C–Cl bonds of which are selectivelyfunctionalized to introduce three alkyl chains. In each step, only a single C–Cl bond was cleaved with the choice of an appropriate Lewis base–boryl radical as the promoter. A vast range of diversely substituted all-carbon quaternarycenters could be accessed directly from these activated CCl3 trichloromethyl groups or by simple derivatizations. The use of
A catalytic defluorinativeboroarylation of alkenes with polyfluoroarenes and B2pin2 with the assistance of a PCy3-ligated copper catalyst was developed. Taking advantage of bench-stable alkenes as latent nucleophiles and avoiding traditional reliance on stoichiometric quantities of organometallics, this method showcased good functional group compatibility and proceeded under very mild reaction conditions
在 PCy 3配位铜催化剂的帮助下,开发了烯烃与多氟芳烃和 B 2 pin 2的催化脱氟硼芳基化反应。利用稳定的烯烃作为潜在的亲核试剂,避免传统上对有机金属化学计量数量的依赖,该方法展示了良好的官能团相容性,并在非常温和的反应条件下进行。高效地制备了一系列有价值的含硼多氟芳烃,包括含全碳季碳中心的三芳基烷基硼酸酯,否则难以获得。
Metallaphotoredox-enabled aminocarboxylation of alkenes with CO2
of binaphthol as a photocatalyst in photoredox catalysis is demonstrated, enabling the single-electron activation of alkenes, generating radical anion intermediates. The remarkable aspect of this strategy lies in the efficient merger of photocatalysis and copper catalysis, enabling the rare orthogonal difunctionalization of alkeneradical anions under redox-neutral conditions. Moreover, this strategy
The exploration into challenging scenarios of the application of elementary reactions offers excellent opportunities for the development of unique transformations under organometallic catalysis. As a ubiquitous reaction of metal alkyl complexes, β-hydride elimination plays a crucial role in a number of important catalytic transformations. However, its functions in these catalytic cycles are limited
对基本反应应用的挑战性场景的探索为在有机金属催化下发展独特的转化提供了极好的机会。作为金属烷基配合物的普遍反应,β-氢化物消除在许多重要的催化转化中起着至关重要的作用。然而,它在这些催化循环中的功能仅限于释放烯烃产物或通过进一步迁移插入产生异构化中间体。在此,我们报道了 β-氢化物消除的精确操作能够实现自动串联铜催化,用于无向烯基 C-H 键与 CO 2的羧化。在这种转化中,促进了烷基铜中间体的 β-氢化物消除,同时它与 CO 反应2被压制。生成的氢化铜反过来与 CO 2反应,提供多任务催化剂的途径,这使得 C-H 键在两个机械上不同的催化循环中串联硼化/羧化。