DFT-Guided Phosphoric-Acid-Catalyzed Atroposelective Arene Functionalization of Nitrosonaphthalene
作者:Wei-Yi Ding、Peiyuan Yu、Qian-Jin An、Katherine L. Bay、Shao-Hua Xiang、Shaoyu Li、Ying Chen、K.N. Houk、Bin Tan
DOI:10.1016/j.chempr.2020.06.001
日期:2020.8
naphthalene via chiral phosphoric acid catalysis. This strategy enables efficient construction of atropisomeric indole-naphthalenes and indole-anilines with excellent stereocontrol. Density functional theory (DFT) calculations provide further insights into the origins of enantioselectivity and the reaction mechanisms. The successful application in the synthesis of NOBINs (2-amino-2′-hydroxy-1,1′-binaphthyl)
Organocatalytic asymmetric arylation of indoles enabled by azo groups
作者:Liang-Wen Qi、Jian-Hui Mao、Jian Zhang、Bin Tan
DOI:10.1038/nchem.2866
日期:2018.1
used as a directing group for many transformations via transition-metal-catalysed aryl carbon–hydrogen (C–H) bond activation, there remain significant unmet challenges in organocatalytic arylation. Here, we show that the azo group can effectively act as both a directing and activating group for organocatalytic asymmetric arylation of indoles via formal nucleophilic aromatic substitution of azobenzene
Atroposelective Construction of Arylindoles by Chiral Phosphoric Acid-Catalyzed Cross-Coupling of Indoles and Quinones
作者:Dong-Liang Lu、Ye-Hui Chen、Shao-Hua Xiang、Peiyuan Yu、Bin Tan、Shaoyu Li
DOI:10.1021/acs.orglett.9b02143
日期:2019.8.2
Structurally novel atropisomeric arylindole frameworks have been successfully constructed through chiral phosphoric acid-catalyzed asymmetric cross-coupling of indoles and quinone derivatives in a precise regioselective manner. This approach features high convergence and functional group tolerance to efficiently deliver diverse heteroaryl atropisomers with excellent enantiocontrol. The dominant formation
Enantioselective synthesis of atropisomeric indoles via iron-catalysed oxidative cross-coupling
作者:Richard R. Surgenor、Xiangqian Liu、Morgan J. H. Keenlyside、William Myers、Martin D. Smith
DOI:10.1038/s41557-022-01095-9
日期:2023.3
exhibit axial chirality are of increasing value and interest across several fields, but direct oxidative methods for their enantioselective synthesis remain elusive. Here we disclose that an iron catalyst in the presence of a chiral PyBOX ligand and an oxidant enables directcoupling between naphthols and indoles to yield atropisomeric heterobiaryl compounds with high levels of enantioselectivity. The
表现出轴向手性的杂二芳基化合物在多个领域的价值和兴趣不断增加,但用于其对映选择性合成的直接氧化方法仍然难以捉摸。在这里,我们公开了在手性 PyBOX 配体和氧化剂存在下的铁催化剂能够使萘酚和吲哚之间直接偶联,从而产生具有高水平对映选择性的阻转异构杂联芳基化合物。该反应表现出显着的化学选择性,并且在没有竞争性自偶联的情况下专门产生交叉偶联产物。机理研究使我们能够假设在反应中产生了吲哚自由基,但这可能是一个非循环事件,并且反应通过形成手性 Fe 结合的萘氧基自由基进行,该自由基被亲核吲哚捕获。
Highly Efficient Synthesis of Hindered 3-Azoindoles via Metal-Free C–H Functionalization of Indoles
of photoswitch molecules, the synthesis of such compounds has been poorly covered in the literature. Herein a high-yielding and operationally simple protocol is reported allowing the synthesis of 3-azoindoles, featuring important steric hindrance around the azo motif. Remarkably, this C–H coupling is characterized by excellent atom economy and occurs under metal-free conditions, at room temperature