Annulation of Benzamides with Arynes Using Palladium with Photoredox Dual Catalysis
摘要:
Efficient annulation of benzamides with arynes using palladium and photoredox dual catalysis under an oxygen atmosphere is disclosed, which circumvents the use of external toxic metal oxidant and proceeds readily via aryne insertion at room temperature to construct the phenanthridinone backbone.
Trifluoromethyl Benzoate: A Versatile Trifluoromethoxylation Reagent
作者:Min Zhou、Chuanfa Ni、Yuwen Zeng、Jinbo Hu
DOI:10.1021/jacs.8b04000
日期:2018.6.6
Trifluoromethyl benzoate (TFBz) is developed as a new shelf-stable trifluoromethoxylation reagent, which can be easily prepared from inexpensive starting materials using KF as the only fluorine source. The synthetic potency of TFBz is demonstrated by trifluoromethoxylation-halogenation of arynes, nucleophilic substitution of alkyl (pseudo)halides, cross-coupling with aryl stannanes, and asymmetric
Tuning chemoselectivity in <i>O</i>-/<i>N</i>-arylation of 3-aryl-1,2,4-oxadiazolones with <i>ortho</i>-(trimethylsilyl)phenyl triflates <i>via</i> aryne insertion
作者:Lijing Zhou、Hongji Li、Wenge Zhang、Lei Wang
DOI:10.1039/c8cc00124c
日期:——
A finely tunable chemoselectivity in arylation of 3-aryl-1,2,4-oxadiazolones with ortho-(trimethylsilyl)phenyl triflates is reported, including silver-catalysed O-arylation and metal-free N-arylation.
Cu-Catalyzed oxidative 1 : 2 couplings of arynes with nucleophilic terminalalkynesunderaerobicconditions are described herein. A mechanistic investigation revealed a plausible involvement of an aryl-Cu(III)-generating pathway. By this method, ubiquitous arenediynes can be efficiently assembled in a single step under mild conditions.
Transition‐Metal‐Free C2‐Functionalization of Pyridines through Aryne Three‐Component Coupling
作者:Avishek Guin、Subrata Bhattacharjee、Akkattu T. Biju
DOI:10.1002/chem.202102005
日期:2021.10
C2-functionalization of pyridines through a transition-metal-free protocol by using aryne multicomponent coupling is demonstrated. The reaction allowed a broad-scope synthesis of C2-substituted pyridine derivatives bearing the −CF3 group in good yields with α,α,α-trifluoroacetophenones as the third component. Activated keto esters could also be employed as the third component in this formal 1,2-di(hetero)arylation
展示了通过使用芳炔多组分耦合通过无过渡金属协议直接对吡啶进行 C2 功能化。该反应允许以良好的收率广泛合成带有-CF 3基团的C2-取代的吡啶衍生物,其中α,α,α-三氟苯乙酮作为第三组分。活化的酮酯也可以用作酮的这种正式的 1,2-二(杂)芳基化中的第三组分。在稀释条件下进行反应抑制了竞争性吡啶-芳烃聚合途径。最初生成的亚吡啶中间体对羰基进行亲核攻击,然后进行类似于 Smiles 重排的 S N Ar 过程,得到所需的产物。
The Aryne Phosphate Reaction**
作者:Thomas M. Haas、Stefan Wiesler、Tobias Dürr‐Mayer、Alexander Ripp、Paraskevi Fouka、Danye Qiu、Henning J. Jessen
DOI:10.1002/anie.202113231
日期:2022.1.3
The ability of phosphates to act as efficient arynophiles is demonstrated. The resulting aryne phosphate reaction is a versatile tool for arene phosphorylation or phosphate arylation. A broad scope of variously arylated phosphate products is culminating in novel nucleotide analogues and a benchmarking octaphosphorylation.