Facile and stereoselective synthesis of (E)-vinyl bromides by microwave-induced reaction of 1,1-dibromoalkenes using a diethyl phosphonate/EtONa/EtOH system
作者:Chunxiang Kuang、Hisanori Senboku、Masao Tokuda
DOI:10.1016/s0040-4020(02)00013-3
日期:2002.2
(E)-Vinyl bromides were readily prepared from 1,1-dibromoalkenes by microwave irradiation within 1 min using a diethyl phosphonate/EtONa/EtOH system. This method utilizes cheap and environmentally friendly reagents, requires only a short reaction time, and gives (E)-vinyl bromides in high stereoselectivities and high yields. (C) 2002 Elsevier Science Ltd. All rights reserved.
A Convenient Stereoselective Reduction of <i>Gem</i>-Dibromides with a Combination of Dimethyl Phosphite and Potassium Carbonate
作者:Yalei Zhao、Tieqiao Chen、Xiang-Bo Wang、Li-Biao Han
DOI:10.1080/10426507.2015.1024786
日期:2015.11.2
GRAPHICAL ABSTRACT Abstract An efficient and highly stereoselectivereduction of a gem-dibromocyclopropane to the corresponding monobromocyclopropane under mild reaction conditions was developed using a combination of dimethyl phosphite and potassium carbonate. This reaction provided a simple and practical way for the synthesis of the valuable monobromocyclopropanes and β-monobromoalkenes.
Ohmic Heating and Ionic Liquids in Combination for the Indium-Promoted Synthesis of 1-Halo Alkenyl Compounds: Applications to Pd-Catalysed Cross-Coupling Reactions
作者:Raquel G. Soengas、Vera L. M. Silva、Joana Pinto、Humberto Rodríguez-Solla、Artur M. S. Silva
DOI:10.1002/ejoc.201501162
日期:2016.1
We have explored the combination of ohmic heating (ΩH) with ionic liquids for indium-promoted reactions and report herein the indium-promoted dehalogenation of gem-dibromo alkenes and the indium-mediated reductive elimination of chlorohydrins for the synthesis of 1-halo alkenyl derivatives. Heck, Stille, Suzuki, Kumada and Sonogashira couplings of the resulting 1-halo-1-alkenes with appropriate reagents
Cross‐Electrophile Coupling of Vinyl Halides with Alkyl Halides
作者:Keywan A. Johnson、Soumik Biswas、Daniel J. Weix
DOI:10.1002/chem.201601320
日期:2016.5.23
An improved method for the reductive coupling of aryl and vinyl bromides with alkylhalides that gave high yields for a variety of substrates at room temperature with a low (2.5 to 0.5 mol %) catalyst loading is presented. Under the optimized conditions, difficult substrates, such as unhindered alkenyl bromides, can be coupled to give the desired olefins with minimal diene formation and good stereoretention
Synthesis of α,ω‐Bis‐Enones by the Double Addition of Alkenyl Grignard Reagents to Diacid Weinreb Amides
作者:Stefan Wiesler、Michael A. Bau、Thomas Niepel、Sara L. Younas、Hieu‐Trinh Luu、Jan Streuff
DOI:10.1002/ejoc.201901043
日期:2019.9.30
The synthesis of bis‐enones from alkenyl bromides and α,ω‐bis‐Weinreb amides via a double Grignard reaction is reported. The work contains reliable protocols for the double addition and the efficient generation of the required substituted alkenyl Grignard reagents from alkenyl bromide precursors.