我们报告了一种通过芳烃加氢将易得的甲硅烷基化芳烃转化为甲硅烷基化饱和碳和杂环的方法。范围包括烷氧基和卤代甲硅烷基取代基。甲硅烷基可被衍生为多种功能,并在有机合成,材料科学以及制药,农业化学和香料研究中得到应用。但是,目前的技术很难获得甲硅烷基化的饱和(杂)循环。氢化的产率取决于硅胶添加剂的量。这种二氧化硅效应还可以显着改善以前公开的高度氟化芳烃的氢化方法(例如,氢化至全顺式C 6 H 6 F 6)。
DOI:
10.1002/anie.201804124
作为产物:
描述:
2-氯-3-(三乙基硅烷基)吡啶 在
palladium on activated charcoal 氢气 作用下,
以93%的产率得到3-(triethylsilyl)pyridine
参考文献:
名称:
Synthesis and synthetic utility of 1-acyl-5-(trialkylsilyl)-1,2-dihydropyridines. A synthesis of (.+-.)-elaeokanine A
Continuous-flow Si–H functionalizations of hydrosilanes <i>via</i> sequential organolithium reactions catalyzed by potassium <i>tert</i>-butoxide
作者:Hyune-Jea Lee、Changmo Kwak、Dong-Pyo Kim、Heejin Kim
DOI:10.1039/d0gc03213a
日期:——
tri-functionalizations of unactivated hydrosilanes via serial organolithiumreactions catalyzed by earth-abundant metal compounds. Based on the screening of various additives, we found that catalytic potassium tert-butoxide (t-BuOK) facilitates the rapid reaction of organolithiums with hydrosilanes. Using a flow microreactor system, various organolithiums bearing functional groups were efficiently generated
Aryl(triethyl)silanes are found to undergo cross‐coupling with iodoarenes in the presence of catalytic amounts of CuBr2 and Ph‐Davephos, as well as cesium fluoride as a stoichiometric base. Because the silicon reagents are readily accessible through catalytic C−H silylation of aromatic substrates, the net transformation allows coupling of aromatic hydrocarbons with iodoarenes via triethylsilylation
Arylsilylation of aryl halides using the magnetically recyclable bimetallic Pd–Pt–Fe<sub>3</sub>O<sub>4</sub> catalyst
作者:Jisun Jang、Sangmoon Byun、B. Moon Kim、Sunwoo Lee
DOI:10.1039/c7cc09926f
日期:——
metal-catalyzed silylations have typically involved the use of homogeneous non-recyclable catalytic systems. In this work, the first example of a recyclable catalytic system for the synthesis of arylsilanes has been reported, which utilizes the bimetallic complex, Pd–Pt–Fe3O4 nanoparticles. Various arylsilanes were prepared by the reaction of aryl iodides (or bromides) with hydrosilanes. This methodology
过渡金属催化的甲硅烷基化通常涉及均相不可回收的催化体系的使用。在这项工作中,已经报道了合成芳基硅烷的可回收催化体系的第一个实例,该体系利用了双金属配合物Pd–Pt–Fe 3 O 4纳米颗粒。通过使芳基碘化物(或溴化物)与氢化硅烷反应来制备各种芳基硅烷。该方法显示出对酯,酮,醛,硝基和氰基的良好官能团耐受性。双金属Pd–Pt–Fe 3 O 4催化体系的活性优于单金属Pt–Fe 3 O 4和Pd–Fe 3 O 4。催化剂。此外,双金属Pd–Pt–Fe 3 O 4催化体系可以轻松回收并重复使用超过20个循环。
Silylation of Aryl Chlorides by Bimetallic Catalysis of Palladium and Gold on Alloy Nanoparticles
Supported palladium‐goldalloy‐catalyzed cross‐coupling of aryl chlorides and hydrosilanes enabled the selective formation of aryl‐silicon bonds. Whereas a monometallic palladium catalyst predominantly promoted the hydrodechlorination of aryl chlorides and goldnanoparticles showed no catalytic activity, gold‐rich palladium‐goldalloynanoparticles efficiently catalyzed the title reaction to give arylsilanes
heteroatom anions and the sluggish reductive elimination. Herein we report an iron-catalyzed method for the silylation of (hetero)aromatic chlorides. It features high efficiency, a broad substrate scope, and excellent functional group compatibility. Moreover, this protocol enables the late-stage silylation of some pharmaceuticals, thus providing an excellent method to access valuable intermediates in medicinal