Highly Diastereo- and Enantioselective Synthesis of Tetrahydro-5<i>H</i>
-Indolo[2,3-<i>b</i>
]quinolines through Copper-Catalyzed Propargylic Dearomatization of Indoles
作者:Wen Shao、Shu-Li You
DOI:10.1002/chem.201703443
日期:2017.9.12
The first copper‐catalyzed intermolecular asymmetric propargylic dearomatization/annulation cascade sequence of indoles via a copper‐allenylidene amphiphilic intermediate has been achieved. This protocol provides a direct asymmetric synthetic method for the preparation of tetrahydro‐5H‐indolo[2,3‐b]quinolines, the core structure of indole alkaloids communesins A–H and perophoramidine. This method features
通过铜-亚烯基两亲中间体,获得了第一个铜催化的吲哚分子间不对称炔丙基脱芳香/环化级联序列。该方案为制备四氢-5 H-吲哚并[2,3- b ]喹啉提供了一种直接的不对称合成方法,该吲哚是吲哚生物碱Communesins A–H和过邻苯二甲idine啶的核心结构。该方法具有出众的收率,高非对映选择性(高达> 19:1 dr)和对映选择性(高达94% ee),温和的条件和广泛的底物范围。
Benzylic C(sp<sup>3</sup>)–C(sp<sup>2</sup>) cross-coupling of indoles enabled by oxidative radical generation and nickel catalysis
作者:Weonjeong Kim、Jangwoo Koo、Hong Geun Lee
DOI:10.1039/d0sc06666d
日期:——
effectively delivered from an aryl (pseudo)halide or an acid anhydride coupling partner, respectively. The developed method utilizes mild conditions and exhibits a wide substrate scope for both substituted indoles and C(sp2)-based reaction counterparts. Mechanisticstudies have shown that competitive hydrogen atom transfer (HAT) processes, which are frequently encountered in conventional methods, are not
Visible Light-Mediated C–H Difluoromethylation of Electron-Rich Heteroarenes
作者:Yi-Ming Su、Yu Hou、Feng Yin、Yue-Ming Xu、Yan Li、Xiaoqi Zheng、Xi-Sheng Wang
DOI:10.1021/ol501094z
日期:2014.6.6
A novel method for visible-light photoredox-catalyzed difluoromethylation of electron-rich N-, O-, and S-containingheteroarenes under mild reaction conditions is developed. Mechanistic investigation indicates that the net C–H difluoromethylation proceeds through an electrophilic radical-type pathway.
Highly Diastereoselective Synthesis of Polycyclic Indolines through Formal [4+2] Propargylic Cycloaddition of Indoles with Ethynyl Benzoxazinanones
作者:Wen Shao、Qing‐Feng Xu‐Xu、Shu‐Li You
DOI:10.1002/asia.202000640
日期:2020.8.17
annulation of indoles and pyrrole with ethynyl benzoxazinanones was described. This protocol provides a concisesynthesis of tetrahydro‐5H‐indolo[2,3‐b]quinolines and tetrahydro‐3H‐pyrrolo[3,2‐b]quinoline, the core structures of alkaloid frameworks, featuring excellent yields, high diastereoselectivity, mild conditions and wide substrate scope.
描述了吲哚和吡咯与乙炔基苯并恶嗪酮的正式[4 + 2]炔丙基环化反应。该协议提供四氢-5-一个简明的合成ħ吲哚并[2,3- b ]喹啉和四氢-3- ħ吡咯并[3,2- b ]喹啉,生物碱框架的核心结构,具有优异的产率,非对映选择性高,温和的条件和广泛的基材范围。
Access to Hexahydrocarbazoles: The Thorpe-Ingold Effects of the Ligand on Enantioselectivity
A novel cyclization reaction of methylenemalonate with indoles is reported, and it provides efficient access to a variety of hexahydrocarbazoles. The enantioselective version was realized by a finely tuned ligand/CuII catalyst. The optically active hexahydrocarbazoles contain three quaternary carbon centers and are obtained in up to 99 % yield with greater than 99:1 d.r. and up to greater than 99 %
报道了丙二酸亚丙二酸酯与吲哚的新型环化反应,它可有效地获得各种六氢咔唑。对映选择性形式是通过微调的配体/ Cu II催化剂实现的。光学活性的六氢咔唑包含三个季碳中心,并以高达99%的收率和大于99:1的dr以及高达大于99%的ee获得。该反应可以以克为单位进行,产物的立体选择性转化导致了来自Kopsia植物的一系列生物碱的核心结构。