[Pd(IPr*OMe)(acac)Cl]: Tuning the N-Heterocyclic Carbene in Catalytic C–N Bond Formation
摘要:
A new N-heterocyclic ligand IPr*(OMe) [N,N'-bis(2,6-bis(diphenylmethyl)-4-methoxyphenyl)imidazol-2-ylidene] has been synthesized and compared with its earlier methyl-substituted congener IPr* [N,N'-bis(2,6-bis(diphenylmethyl)-4-methylphenyl)imidazol-2-ylidene]. IPr*(OMe) was successfully bound to palladium, and the catalytic activity of the resulting complex [Pd(IPr*(OMe))(acac)Cl] was investigated in Buchwald-Hartwig arylamination. Catalytic activity was compared to that of [Pd(IPr*)(acac)Cl].
[Pd(IPr*OMe)(acac)Cl]: Tuning the N-Heterocyclic Carbene in Catalytic C–N Bond Formation
摘要:
A new N-heterocyclic ligand IPr*(OMe) [N,N'-bis(2,6-bis(diphenylmethyl)-4-methoxyphenyl)imidazol-2-ylidene] has been synthesized and compared with its earlier methyl-substituted congener IPr* [N,N'-bis(2,6-bis(diphenylmethyl)-4-methylphenyl)imidazol-2-ylidene]. IPr*(OMe) was successfully bound to palladium, and the catalytic activity of the resulting complex [Pd(IPr*(OMe))(acac)Cl] was investigated in Buchwald-Hartwig arylamination. Catalytic activity was compared to that of [Pd(IPr*)(acac)Cl].
Efficient C-N and C-S Bond Formation Using the Highly Active [Ni(allyl)Cl(IPr*<sup>OMe</sup>)] Precatalyst
作者:Anthony R. Martin、David J. Nelson、Sébastien Meiries、Alexandra M. Z. Slawin、Steven P. Nolan
DOI:10.1002/ejoc.201402022
日期:2014.5
Two new [Ni(allyl)Cl(NHC)] complexes with the bulky yet flexible N-heterocycliccarbene (NHC) ligands IPr* N,N'-bis[2,6-bis(diphenylmethyl)-4-methylphenyl]imidazole-2-ylidene} and IPr*OMe N,N'-bis[2,6-bis(diphenylmethyl)-4-methoxyphenyl]imidazol-2-ylidene} are reported. These complexes were employed in the amination and sulfination of aryl halide species and were shown to perform well in these reactions
General and Mild Ni<sup>0</sup>-Catalyzed α-Arylation of Ketones Using Aryl Chlorides
作者:José A. Fernández-Salas、Enrico Marelli、David B. Cordes、Alexandra M. Z. Slawin、Steven P. Nolan
DOI:10.1002/chem.201406457
日期:2015.3.2
A general methodology for the α‐arylation of ketones using a nickel catalyst has been developed. The new well‐defined [Ni(IPr*)(cin)Cl] (1 c) pre‐catalyst showed great efficiency for this transformation, allowing the coupling of a wide range of ketones, including acetophenone derivatives, with various functionalised arylchlorides. This cinnamyl‐based Ni–N‐heterocyclic carbene (NHC) complex has demonstrated
已经开发了使用镍催化剂对酮进行α-芳基化的一般方法。定义明确的新型[Ni(IPr *)(cin)Cl](1 c)预催化剂显示出极高的转化效率,使各种酮(包括苯乙酮衍生物)与各种官能化的芳基氯化物偶合。这种基于肉桂基的Ni-N-杂环卡宾(NHC)配合物表现出与以前报道的NHC-Ni催化剂不同的行为。初步的机理研究表明,Ni 0 / Ni II催化循环起作用。
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
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。