Merging Photoredox PCET with Ni-Catalyzed Cross-Coupling: Cascade Amidoarylation of Unactivated Olefins
作者:Shuai Zheng、Álvaro Gutiérrez-Bonet、Gary A. Molander
DOI:10.1016/j.chempr.2018.11.014
日期:2019.2
integration of amidylradicals with cross-coupling chemistry opens new avenues for reaction design. However, the lack of efficient methods for the generation of such radical species has prevented many such transformations from being brought to fruition. Herein, the amidoarylation of unactivated olefins by a cascade processfrom non-functionalized amides is reported by merging, for the first time, photoredox
Catalytic Alkene Carboaminations Enabled by Oxidative Proton-Coupled Electron Transfer
作者:Gilbert J. Choi、Robert R. Knowles
DOI:10.1021/jacs.5b05377
日期:2015.7.29
N-arylamides (bond dissociation freeenergies ∼ 100 kcal/mol) via concerted proton-coupled electron transfer (PCET) and mediating efficient carboamination reactions of the resulting amidyl radicals. This manner of PCET activation, which finds its basis in numerous biological redox processes, enables the formal homolysis of a stronger amide N-H bond in the presence of weaker allylic C-H bonds, a selectivity that
作者:Shuai Zheng、Shuo-Qing Zhang、Borna Saeednia、Jiawang Zhou、Jessica M. Anna、Xin Hong、Gary A. Molander
DOI:10.1039/d0sc01459a
日期:——
The selective 1,2-aminoacylation of olefins provides opportunities for the rapid construction of nitrogen-containing molecules. However, the lack of CO-free acylation reactions has limited their application. By using photoredox proton-coupled electron transfer (PCET)/Ni dual-catalysis, a highly regio- and diastereoselective amidoacylation of unactivated olefins has been developed. Various acyl electrophiles
Iodoarene-Catalyzed Oxyamination of Unactivated Alkenes to Synthesize 5-Imino-2-Tetrahydrofuranyl Methanamine Derivatives
作者:Xiao-Jun Deng、Hui-Xia Liu、Lu-Wen Zhang、Guan-Yu Zhang、Zhi-Xiang Yu、Wei He
DOI:10.1021/acs.joc.0c02047
日期:2021.1.1
alkene by an in situ generated cationic iodonium(III) intermediate, which is subsequently attacked by an oxygen atom (instead of nitrogen) of amides to form a five-membered ring intermediate. Finally, this intermediate undergoes an SN2 reaction by NTs2 as the nucleophile to give the oxygen and nitrogen difunctionalized 5-imino-2-tetrahydrofuranyl methanamine product. An asymmetric variant of the present
此处报道的是室温下无金属的碘代芳烃催化的未活化烯烃的氧化。在此过程中,烯烃通过酰胺基团的氧原子和外源HNT 2分子中的氮进行双官能化。这种温和的露天反应提供了对N-双甲苯磺酰基取代的5-亚氨基-2-四氢呋喃基甲胺衍生物的有效合成,这是药物开发和生物学研究的重要主题。基于实验和密度泛函理论计算的机理研究表明,这种转变是通过原位活化底物烯烃而进行的生成的阳离子碘鎓(III)中间体,随后被酰胺的氧原子(而不是氮)攻击形成五元环中间体。最后,该中间体通过作为亲核试剂的NTs 2经历S N 2反应,得到氧和氮双官能化的5-亚氨基-2-四氢呋喃基甲胺产品。使用手性碘代芳烃作为催化剂的本发明烯烃氧化胺的不对称变体对于某些底物也给出了有希望的结果。
mCPBA-mediated dioxygenation of unactivated alkenes for the synthesis of 5-imino-2-tetrahydrofuranyl methanol derivatives
作者:Xiaojun Deng、Luwen Zhang、Huixia Liu、Yu Bai、Wei He
DOI:10.1016/j.tetlet.2020.152620
日期:2020.12
A mCPBA-mediated, metal-free, intramolecular dioxygenation reaction of unactivatedalkenes is reported. In the presence of m-chlorobenzoic peracid, different unsaturated amide substrates could be cyclized via epoxide intermediates, producing the corresponding 5-imino-2-tetrahydrofuranyl methanol products in up to 94% yield at room temperature.