N-Heterocyclic Carbene Ligand-Controlled Regioselectivity for Nickel-Catalyzed Hydroarylation of Vinylarenes with Benzothiazoles
作者:Rui-Peng Li、Zheng-Wang Shen、Qin-Jia Wu、Jie Zhang、Hong-Mei Sun
DOI:10.1021/acs.orglett.9b01645
日期:2019.7.5
A facile regioselective switch for nickel-catalyzed hydroarylation of vinylarenes with benzothiazoles has been developed, which relies on the simple structural variation of novel Ni(II) complexes of the type Ni(NHC)[P(OR)3]Br2. Using magnesium turnings as the reductant, Ni(IMes)[P(OEt)3]Br2 afforded branched products, while Ni(IPr*OMe)[P(OEt)3]Br2 created steric demand to afford linear products. This
Site-Selective and Stereoselective C(sp3)–H Borylation of Alkyl Side Chains of 1,3-Azoles with a Silica-Supported Monophosphine-Iridium Catalyst
作者:Masaya Sawamura、Ryo Murakami、Tomohiro Iwai
DOI:10.1055/s-0035-1561599
日期:——
Site-selective and stereoselectiveC(sp3)–H borylation of alkyl side chains of 1,3-azoles with bis(pinacolato)diboron was effectively catalyzed by a silica-supported monophosphine-iridium catalyst. The borylation occurred under relatively mild conditions (2 mol% Ir, 50–90 °C), affording the corresponding primary and secondary alkylboronates. This system was applicable to a variety of 1,3-(benzo)azoles
Visible-Light-Driven Deoxygenative Heteroarylation of Alcohols with Heteroaryl Sulfones
作者:Yanjiao Xiong、Qi Zhang、Jun Zhang、Xuesong Wu
DOI:10.1021/acs.joc.3c02733
日期:2024.3.1
visible-light-promoted deoxygenative radical heteroarylation of alcohols was achieved in the absence of any external photosensitizers. The processes occur through the generation of xanthate salts from alcohols, followed by SET and fragmentation, delivering alkyl radicals to react with heteroaryl sulfones. This method is amenable for a wide range of alcohols with good functional group tolerance, providing a practical
可见光促进的醇脱氧自由基杂芳基化是在没有任何外部光敏剂的情况下实现的。该过程是通过从醇生成黄原酸盐,然后进行 SET 和裂解,传递烷基自由基与杂芳基砜反应而发生的。该方法适用于多种醇,具有良好的官能团耐受性,为苯并杂芳烃的烷基化提供了实用的策略。机理研究表明,黄原酸阴离子的直接可见光激发和随后的 SET 引发反应。
FOKKEN B.; WOOSSMANN D.; BRAEUNIGER H.; PESEKE K.; KRISTEN H., PHARMAZIE <PHAR-AT>, 1977, 32, NO 10 566-569
作者:FOKKEN B.、 WOOSSMANN D.、 BRAEUNIGER H.、 PESEKE K.、 KRISTEN H.