Minisci 烷基化可用于通过烷基自由基加成对芳烃进行官能化。当前制备烷基自由基的方法遵循来自各种官能团的氧化或还原途径。开发超越这些传统方法的新战略仍然难以捉摸,但意义重大。在本文中,我们提出了一种氧化还原中性和无催化剂的方案,以在芳烃的三氟甲基化和一般烷基化的背景下产生烷基自由基。该协议通过 Norrish I 型概念产生烷基自由基,适应各种官能团并以良好的产率提供产品。该方法在光的辅助下鉴定了一系列化合物作为三氟甲基化和烷基化试剂。预计这些化合物可以在其他涉及自由基的反应中找到潜在的应用。
Visible Light-Promoted Aliphatic C–H Arylation Using Selectfluor as a Hydrogen Atom Transfer Reagent
作者:Hong Zhao、Jian Jin
DOI:10.1021/acs.orglett.9b01635
日期:2019.8.16
A mild, practical method for direct arylation of unactivated C(sp3)–H bonds with heteroarenes has been achieved via photochemistry. Selectfluor is used as a hydrogen atom transfer reagent under visible light irradiation. A diverse range of chemical feedstocks, such as alkanes, ketones, esters, and ethers, and complex molecules readily undergo intermolecular C(sp3)–C(sp2) bond formation. Moreover, a
Visible-light-mediated photoredox minisci C–H alkylation with alkyl boronic acids using molecular oxygen as an oxidant
作者:Jianyang Dong、Fuyang Yue、Hongjian Song、Yuxiu Liu、Qingmin Wang
DOI:10.1039/d0cc05946c
日期:——
report a protocol for direct visible-light-mediated Minisci C–H alkylation reactions of heteroarenes with alkyl boronic acids using molecular oxygen as the sole oxidant. This mild protocol uses an inexpensive, green oxidant; permits efficient functionalization of various N-heteroarenes with a broad range of primary and secondaryalkyl boronic acids; and is scalable to the gram level. We demonstrated the
Visible-light-mediated Minisci C–H alkylation of heteroarenes with unactivated alkyl halides using O<sub>2</sub> as an oxidant
作者:Jianyang Dong、Xueli Lyu、Zhen Wang、Xiaochen Wang、Hongjian Song、Yuxiu Liu、Qingmin Wang
DOI:10.1039/c8sc04892d
日期:——
visible-light-mediated Minisci C–H alkylation of heteroarenes with unactivated alkyl halides using molecular oxygen as an oxidant at room temperature. This mild protocol is compatible with a wide array of sensitive functional groups and has a broad substrate scope. Notably, functionalization of (iso)quinolines, pyridines, phenanthrolines, quinazoline, and other heterocyclic compounds with unactivated primary, secondary
Photoredox-Mediated Minisci C–H Alkylation Reactions between N-Heteroarenes and Alkyl Iodides with Peroxyacetate as a Radical Relay Initiator
作者:Zhen Wang、Jianyang Dong、Yanan Hao、Yongqiang Li、Yuxiu Liu、Hongjian Song、Qingmin Wang
DOI:10.1021/acs.joc.9b02848
日期:2019.12.20
We developed a protocol for photoredox-mediated Minisci C-H alkylation reactions of N-heteroarenes in which readily available tert-butyl peroxyacetate acts as a radical relay precursor to generate alkylradicals from alkyliodides. This mild protocol tolerated a broad range of functional groups and could therefore be used for late-stage functionalization of complex nitrogen-containing natural products
[EN] CATALYST-FREE AND REDOX-NEUTRAL INNATE TRIFLUOROMETHYLATION AND ALKYLATION OF (HETERO)AROMATICS ENABLED BY LIGHT<br/>[FR] TRIFLUOROMÉTHYLATION INNÉE EXEMPTE DE CATALYSEUR ET NEUTRE À L'OXYDORÉDUCTION, ET ALKYLATION DE COMPOSÉS (HÉTÉRO)AROMATIQUES ACTIVÉS PAR LA LUMIÈRE
申请人:THE ROYAL INSTITUTION FOR THE ADVANCEMENT OF LEARNING/MCGILL UNIV
公开号:WO2019060998A1
公开(公告)日:2019-04-04
The present disclosure relates to reagents and method for performing trifluoromethylation, difluoromethylation or alkylation of aromatic or heteroaromatic rings in a redox-neutral manner without any catalyst which are enabled by light. In addition, there are methods for synthesizing the starting reagents used in the trifluoromethylation, difluoromethylation or alkylation reactions.