Nickel-Catalyzed Regioselectivity-Switchable Hydroheteroarylation of Vinylarenes with Electron-Rich Heteroarenes
作者:Yu Shui、Sajid Imran、Wen-Hui Jin、Yang Liu、Nadia Ismaeel、Hong-Mei Sun
DOI:10.1021/acs.orglett.3c03618
日期:2023.12.15
We report the first example of a regioselectivity switch in the hydroheteroarylation of vinylarenes with electron-rich heteroarenes, including benzofurans, benzothiophenes, and indoles, using an expedient ligand-controlled strategy. In the presence of NaOtBu, Ni(IMesMe)[P(OEt)3]Br2 yields C2-alkylated heteroarenes with high branched selectivity, whereas the use of Ni(IPr*OMe)[P(OEt)3]Br2 favors the
我们报告了使用便利的配体控制策略,在乙烯基芳烃与富电子杂芳烃(包括苯并呋喃、苯并噻吩和吲哚)的氢杂芳基化中进行区域选择性转换的第一个例子。在 NaO t Bu 存在下,Ni(IMes Me )[P(OEt) 3 ]Br 2产生具有高支化选择性的 C2-烷基化杂芳烃,而使用 Ni(IPr *OMe )[P(OEt) 3 ]Br 2有利于相应线性产物的形成。这种稳健的方法还可以在不使用导向基团的情况下轻松获得一系列 C2 烷基化的富电子杂芳烃。
Pincer Nickel‐Catalyzed Olefination of Alcohols with Benzylphosphine Oxides
作者:Yu‐Tong Duan、Bo Yang、Zhong‐Xia Wang
DOI:10.1002/asia.202400255
日期:2024.6.3
reaction of alcohols with benzylphosphine oxides to form alkenes in good yields. The protocol suits for a wide scope of substrates and generates only E-configurated alkenes. The method also shows good compatibility of functional groups. Methoxy, methylthio, trifluoromethyl, ketal, fluoro, chloro, bromo, thienyl, and furyl groups are tolerated. The mechanism studies support that the reaction proceeds through
N,N,P-Pincer 镍配合物可有效催化醇与氧化苄基膦的反应,以良好的收率形成烯烃。该方案适用于多种底物,并且仅生成E构型烯烃。该方法还表现出良好的官能团相容性。甲氧基、甲硫基、三氟甲基、缩酮、氟、氯、溴、噻吩基和呋喃基均可接受。机理研究表明,该反应是通过醇催化脱氢生成醛或酮,然后在 KO t Bu 存在下与氧化苄基二苯基膦缩合进行的。