Catalytic 1,4-Selective Hydrosilylation of Pyridines and Benzannulated Congeners
作者:C. David F. Königs、Hendrik F. T. Klare、Martin Oestreich
DOI:10.1002/anie.201305028
日期:2013.9.16
The hydrosilylation of pyridines and quinolines is strictly 1,4‐selective and likely involves an ionic one‐step rather than the established radical two‐step hydride transfer from a ruthenium(II) hydride complex onto the respective pyridinium and quinolinium ion intermediates (see scheme; ArF=3,5‐(CF3)2C6H3). Even 4‐substituted substrates react highly regioselectively. Isoquinolines yield the 1,2‐reduced
根本不同!吡啶和喹啉的氢化硅烷化严格是1,4-选择性的,可能涉及离子一步法,而不是既定的自由基二步法将氢化物从氢化钌(II)转移到相应的吡啶鎓和喹啉鎓离子中间体上(参见方案) ; Ar F= 3,5-(CF 3)2 C 6 H 3)。甚至4个被取代的底物也具有高度区域选择性的反应。异喹啉可生成1,2还原的杂环。
Cationic Ru–Se Complexes for Cooperative Si–H Bond Activation
作者:Marvin Oberling、Elisabeth Irran、Yasuhiro Ohki、Hendrik F. T. Klare、Martin Oestreich
DOI:10.1021/acs.organomet.0c00719
日期:2020.12.28
The preparation and structural characterization of mononuclear tethered ruthenium(II) complexes of type [(DmpSe)Ru(PR3)]+BArF4– (DmpSe = 2,6-dimesitylphenyl selenolate, ArF = 3,5-bis(trifluoromethyl)phenyl) are described. Unlike relevant known selenolate complexes, the reported family of complexes is cationic with a single monodentate selenolate ligand. The ability of these complexes to engage in cooperative
[(DmpSe)Ru(PR 3)] + BAr F 4 –(DmpSe = 2,6-二苯二甲硒基苯硒酸酯,Ar F的类型的单核束缚钌(II)配合物的制备和结构表征描述了= 3,5-双(三氟甲基)苯基。与已知的相关硒酸盐络合物不同,所报道的络合物家族是具有单个单齿硒酸盐配体的阳离子。研究了这些络合物在Ru-Se键上参与Si-H键协同活化的能力,并通过多核NMR光谱和X射线衍射对氢化硅烷加合物进行了充分表征。评估了这些配合物作为各种离子脱氢甲硅烷基化和氢化硅烷化反应的催化剂的有用性。在所有阶段,将新的配合物与其硫醇盐同系物[(DmpS)Ru(PR 3)] + BAr F 4 –(DmpS = 2,6-二甲磺基苯硫醇酯)。硒酸酯和硫醇酸酯配合物之间的差异很小,但是可以测量。较大的硒原子在Ru-Se键周围提供的空间比硫在Ru-S键处提供的空间更大,因此,硒酸酯络合物可以容纳空间上要求更高的氢硅烷。
Facile Catalytic Hydrosilylation of Pyridines
作者:Dmitry V. Gutsulyak、Art van der Est、Georgii I. Nikonov
DOI:10.1002/anie.201006135
日期:2011.2.7
Not only surprisingly facile, a hydrosilylation of pyridines under the catalysis of [Cp(iPr3P)Ru(NCCH3)2]+ has the advantages that it is 1,4‐regioselective and reversible. The products can be transformed in a variety of ways (see scheme). The related complex [CpRu(NCCH3)3]+ catalyzes the two‐hydrogen‐atom reduction of phenanthroline by HSiMe2Ph/water.
1,4-Hydrosilylation of Pyridine by Ruthenium Catalyst: A New Reaction and Mechanism
作者:Kohtaro Osakada
DOI:10.1002/anie.201008199
日期:2011.4.18
Making introductions: A half‐sandwich Ru complex catalyzes the hydrosilylation of pyridine derivatives to produce N‐silyl‐3‐hydropyridine through a 1,4‐addition of the Si–H group (see scheme). The reversibility of the hydrosilylation was suggested based on the experimental results.
The preparation of a coordinatively unsaturated NHC ruthenium complex with a tethered 2,6-dimesitylphenyl thiolate is described. Unlike related mononudear phosphine complexes, the NHC complex forms an air-stable dimer with bridging sulfur ligands in both the solid state and solution. The dinuclear complex is a precatalyst and activates Si H bonds upon heat-or donor-assisted dissociation into the catalytically active monomer. Its usefulness is illustrated with representative dehydrogenative Si X coupling and hydrosilylation reactions.