Et3B-Induced Hydrogermylation of Alkenes and Silyl Enol Ethers
摘要:
Tri-2-furanylgermane in the presence of a catalytic amount of Et3B adds to internal alkenes as well as terminal alkenes effectively to give the corresponding adducts in good to excellent yields. The addition of tri-2-furanylgermane to silyl enol ethers followed by elimination of germyl and siloxy moieties provides a new route for the conversion of ketones into alkenes.
Reduction of alkoxysilanes, halo-silanes and -Germanes with lithium aluminium hydride under phase-transfer conditions
作者:V.N. Gevorgyan、L.M. Ignatovich、E. Lukevics
DOI:10.1016/0022-328x(85)87220-x
日期:1985.4
In the presence of phase-transfer catalysts, silicon and germanium organohydrides were obtained in high yield by reduction of the corresponding halo and alkoxy derivatives with lithiumaluminium hydride in the solid LiAlH4/hydrocarbon two-phase system.
Tri-2-furylgermane proved to be an effective reagent for the radical reduction of organichalides. Treatment of 1-bromododecane with tri-2-furylgermane in THF at 25 °C in the presence of a catalytic amount of triethylborane afforded dodecane almost quantitatively. Radical cyclization of 2-iodoethanal allyl acetal afforded five-membered products under the same reaction conditions. These reactions proceeded
A direct synthesis of acylmetals from alkynes with group 14 metal hydride and CO is reported. The Pd(0)-catalyzed reaction of alkynes with tri(2-furyl)germane under ambient pressure of CO provides alpha,beta-unsaturated acylgermanes in good yields. Conversion of acylgermanes to the corresponding amides is achieved.
LUKEVITS, EH. YA.;IGNATOVICH, L. M.;POPELIS, YU. YU.;ROZITE, S. X.;MAZHEJ+, IZV. AN LATVSSR. CEP. XIM., 1985, N 1, 73-76
作者:LUKEVITS, EH. YA.、IGNATOVICH, L. M.、POPELIS, YU. YU.、ROZITE, S. X.、MAZHEJ+
DOI:——
日期:——
Radical Germylzincation of α-Heteroatom-Substituted Alkynes
作者:Karen de la Vega-Hernández、Elise Romain、Anais Coffinet、Kajetan Bijouard、Geoffrey Gontard、Fabrice Chemla、Franck Ferreira、Olivier Jackowski、Alejandro Perez-Luna
DOI:10.1021/jacs.8b09851
日期:2018.12.19
The regio- and stereoselectiveaddition of germanium and zinc across the C-C triple bond of nitrogen-, sulfur-, oxygen-, and phosphorus-substituted terminal and internal alkynes is achieved by reaction with a combination of R3GeH and Et2Zn. Diagnostic experiments support a radical-chain mechanism and the β-zincated vinylgermanes that show exceptional stability are characterized by NMR spectroscopy
通过与 R3GeH 和 Et2Zn 的组合反应,锗和锌在氮、硫、氧和磷取代的末端和内部炔烃的 CC 三键上的区域和立体选择性加成。诊断实验支持自由基链机制,并通过 NMR 光谱和 X 射线晶体学表征显示出异常稳定性的 β-锌化乙烯基锗烷。这种新的自由基锗基锌化反应的独特之处在于,形成的 C(sp2)-Zn 键仍然可用于随后的原位 Cu(I)-或 Pd(0)-介导的 CC 或 C-杂原子键的形成,同时保留双键几何。