Copper-Catalyzed and Indium-Mediated Methoxycarbonylation of Unactivated Alkyl Iodides with Balloon CO
作者:Yanchi Chen、Lei Su、Hegui Gong
DOI:10.1021/acs.orglett.9b01573
日期:2019.6.21
This work emphasizes the synthesis of alkyl esters via Cu-catalyzed and In-mediated alkoxycarbonylation of unactivatedalkyliodides in the presence of In or InI. The reactions were suitable for the preparation of primary, secondary, and even tertiary alkyl esters, representing an exceptionally rare example for the creation of quaternary carbon centers upon formation of esters. The preliminary mechanistic
这项工作强调在In或InI的存在下,通过Cu催化和In介导的未活化烷基碘的烷氧基羰基化来合成烷基酯。该反应适合于伯,仲,甚至叔烷基酯的制备,代表了在形成酯时生成季碳中心的极为罕见的例子。初步的机理研究表明,涉及烷基自由基,而Cu / In / CO在羰基化事件中起着协同作用。
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
Visible-light-initiated manganese-catalyzed Giese addition of unactivated alkyl iodides to electron-poor olefins
作者:Jianyang Dong、Xiaochen Wang、Zhen Wang、Hongjian Song、Yuxiu Liu、Qingmin Wang
DOI:10.1039/c9cc06400a
日期:——
Herein, we report a mild protocol for direct visible-light-initiated Giese addition of unactivated alkyl iodides to electron-poor olefins (Michael acceptors) with catalysis by decacarbonyl dimanganese, Mn2(CO)10, an inexpensive earth-abundant-metal catalyst. This protocol is compatible with a wide array of sensitive functional groups and has a broad substrate scope with regard to both the alkyl iodide
Synthetic Radical Reactions Using Dibutylchlorogermane and Dibutylethoxygermane as Radical Mediators
作者:Katsukiyo Miura、Akira Hosomi、Kazunori Ootsuka
DOI:10.1055/s-2005-921927
日期:——
In the presence of Et3B as radical initiator, dibutylchlorogermane (1a) and dibutylethoxygermane (1b) reacted with bromo- and iodoalkanes at room temperature to give the corresponding alkanes in high yields. Hydrogermane 1a was more reactive than 1b. However, 1b worked as a better radical mediator in intermolecular radical addition of haloalkanes to electron-deficient alkenes.