最近,水性胶束介质中的光催化为激活强碳卤键开辟了广阔的途径。然而,到目前为止,它主要探索了强烈的还原条件,将可用的化学空间限制为自由基或阴离子反应性。在这里,我们展示了一种可控的光催化策略,该策略通过自由基或阳离子途径引导氯化苯甲酰胺的反应,从而实现化学发散的 C-H 芳基化或N-脱烷基化。该催化系统在温和的条件下运行,亚甲基蓝作为光催化剂,蓝色 LED 作为光源。介绍了决定底物反应性、选择性和初步机理研究的因素。
A benzene-bridged divanadium complex-early transition metal catalyst for alkene alkylarylation with PhI(O<sub>2</sub>CR)<sub>2</sub><i>via</i> decarboxylation
作者:Lei Zhang、Hongfei Zhou、Shaokun Bai、Shaodan Li
DOI:10.1039/d0dt04295a
日期:——
alkene alkylarylation with hypervalent iodine(III) reagents (HIRs) via decarboxylation to generate regioselectively diverse indolinones. Furthermore, the mild nature of this reaction was amenable to a wide range of functionalities on alkenes and HIRs. Mechanistic studies revealed a relay sequence of decarboxylative radical alkylation/radical arylation/oxidative re-aromatization.
全面研究了苯桥二钒配合物的合成,结构和催化活性。通过以苯为溶剂用石墨烯酸钾(KC 8)还原由β-二酮化支持的(Nacnac)VCl 2(1)(Nacnac =(2,6- i Pr 2 C 6 H 3 NCMe)2 HC)访问苯桥连的倒夹心二钒配合物(μ-η 6:η 6 -C 6 H ^ 6)[V(Nacnac)] 2(图2a),它可催化与高价碘烯烃alkylarylation(III试剂(HIR)通过脱羧生成区域选择性多样的吲哚啉酮。此外,该反应的温和性质适合于烯烃和HIR的多种官能度。机理研究揭示了脱羧自由基烷基化/自由基芳基化/氧化再芳构化的中继序列。
Hydroarylation of Activated Alkenes Enabled by Proton-Coupled Electron Transfer
of N-arylacrylamides with high 5-exo-trig selectivity through robust proton-coupled electrontransfer (PCET). This mild hydroarylation protocol provides a straightforward entry to structurally valuable oxindoles and complements previously established 6-endo-trig cyclization by photochemical triplet energy transfer (TET).
Visible-light-induced deboronative alkylarylation of acrylamides with organoboronic acids
作者:Xuezhi Li、Man-Yi Han、Bin Wang、Lei Wang、Min Wang
DOI:10.1039/c9ob01023h
日期:——
A visible-light-induced deboronative alkylarylation of acrylamides with boronic acids was developed via a tandem reaction process.
通过串联反应过程,开发了一种可见光诱导的丙烯酰胺与硼酸脱硼芳香化反应。
Molecular Oxygen-Promoted General and Site-Specific Alkylation with Organoboronic Acid
作者:Anbo Ling、Lizhi Zhang、Ren Xiang Tan、Zhong-Quan Liu
DOI:10.1021/acs.joc.8b02277
日期:2018.12.7
alkylating method using organoboronic acid under 1 atm of oxygen is developed. It allows a facile access to a widerange of functionalized molecules with privileged scaffolds in drugs and natural products such as oxindoles, quinolinones, chromones, naphthoquinones, coumarins, and quinolones. In contrast to previous alkylation approaches that generally requiring transition-metal catalysis and a stoichiometric
Radical Decarboxylation/Annulation of Acrylamides with Aliphatic Acyl Peroxides
作者:Changduo Pan、Yu Fu、Qingting Ni、Jin-Tao Yu
DOI:10.1021/acs.joc.7b00663
日期:2017.5.5
A radical decarboxylation/annulation of acrylamides with aliphatic acyl peroxides was developed, giving a series of linear alkylated oxindoles in moderate to good yields. The reaction used aliphatic acyl peroxides as the linear alkyl radical source and tolerated a broad scope of substrates under metal-free conditions, offering a simple and efficient approach toward alkylated oxindoles.