We report the first terminal trifluoromethylation at aryl and alkyl ketones’ γ, δ, ε, or more remote sites via the selective C–C bond cleavage of cycloalkanols. The noncovalent interactions between alcohols and hypervalent iodines(III) reagents were disclosed to activate both alcohols and the Togni I reagent in the dual photoredox/copper catalysis for the transformation. This reaction was scalable
我们报告了通过环烷醇的选择性 C-C 键断裂在芳基和烷基酮的 γ、δ、ε 或更远的位点发生的第一个末端三氟甲基化。公开了醇和高价碘 (III) 试剂之间的非共价相互作用,以在双光氧化还原/铜催化转化中激活醇和 Togni I 试剂。该反应可扩展到克级合成,适用于结构复杂的类固醇三氟甲基化,并可扩展到五氟乙基化。
<scp>Nickel‐Catalyzed Cross‐Coupling</scp>
of Aryl Pivalates with Cyclobutanols Involving C—O and C—C Bond Cleavage
<sup>†</sup>
作者:Yi Gan、Ninghui Zhang、Shaoxu Huang、Yuanhong Liu
DOI:10.1002/cjoc.202000319
日期:2020.12
An efficient nickel‐catalyzed cross‐coupling of aryl pivalates with cyclobutanols is described. The use of Ni(cod)2/PCy3/base as the catalytic system enables the cleavage of inert C—O bond and C—Cbond under mild conditions, thus providing a facile access to γ‐arylated ketones in generally good to excellent yields. This transformation is also characterized by wide substrate scope and functional group
The alkoxylradical is an important reactive intermediate in mechanistic studies and organic synthesis; however, its current generation fromalcohol oxidation heavily relies on transition metal activation under strong oxidative conditions. Here we report the first visible-light-induced alcohol oxidation to generate alkoxylradicals by cyclic iodine(III) reagent catalysis under mild reaction conditions
Rhodium(II)-Catalyzed Desaturative [3+2] Tandem Cyclization of Arylcycloalkanes with β-Dicarbonyls
作者:Xinyu Liu、Qi Yang、Qiwei Wang、Yuanhua Wang
DOI:10.1021/acs.orglett.3c00672
日期:——
Synthetically important scaffolds, fused tricyclic frameworks containing a 2,3-cyclo[b]dihydrofuran unit, play a crucial role in drug discovery. In this study, we demonstrate that rhodium(II)/N-fluorobenzenesulfonimide can catalyze the in situ generation of highly reactive alkene intermediates from commonly accessible alkanes, which undergo intermolecular [3+2] tandem cyclization with the simultaneously
具有重要合成意义的支架,即包含 2,3-环[ b ] 二氢呋喃单元的融合三环框架,在药物发现中起着至关重要的作用。在这项研究中,我们证明了铑 (II)/ N-氟苯磺酰亚胺可以催化从常见的烷烃原位生成高反应性烯烃中间体,这些烷烃与同时产生的 β-二羰基自由基进行分子间 [3+2] 串联环化合成了一系列包含 2,3-环[ b ] 二氢呋喃单元和季碳中心的稠合三环骨架。
Rhodium(II)‐Catalyzed C(sp
<sup>3</sup>
)−H Diamination of Arylcyclobutanes
作者:Xinyu Liu、Zhifan Wang、Qiwei Wang、Yuanhua Wang
DOI:10.1002/anie.202205493
日期:2022.7.25
In a short time, direct C(sp3)−H diamination of arylcyclobutanes catalyzed by rhodium(II) was successfully achieved in one step. Unlike the classical rhodium(II) nitrene reaction, this cascade reaction consists of nine elementary steps, in which the multiple consecutive oxidative radical-polar crossovers, desaturation, and nitrogen-radical addition are the major chemical transformations.
在很短的时间内,一步成功地实现了由铑(II)催化的芳基环丁烷的直接C(sp 3 )-H二化反应。与经典的铑 (II) 氮烯反应不同,该级联反应由九个基本步骤组成,其中多个连续的氧化自由基-极性交叉、去饱和和氮自由基加成是主要的化学转化。