Tandem Suzuki-Miyaura Cross-Coupling/Dehydrobromination of 1,1-Dibromoalkenes to Alkynes with a Cyclobutene-1,2-diylbis(imidazolium) Salt as Catalyst Precursor
作者:Andreas Schmidt、Alireza Rahimi
DOI:10.1055/s-0029-1218848
日期:2010.8
A cyclobutene-1,2-bis(imidazolium) salt proved to be an efficient catalyst precursor for one-pot tandem Suzuki-Miyaura/dehydrobromination reactions for the synthesis of alkynes starting from 1,1-dibromoalkenes and palladium(II) acetate, aryl boronic acids, and potassium tert-butoxide in toluene. Starting materials were prepared from aldehydes under Corey-Fuchs conditions.
A Tandem Oxidation Procedure for the Conversion of Alcohols into 1,1-Dibromoalkenes
作者:Richard J. Taylor、Steven A. Raw、Mark Reid、Estelle Roman
DOI:10.1055/s-2004-820027
日期:——
A practical and concise route to dibromoalkenes directly from activated alcohols in good to excellent yields using a new Tandem OxidationProcedure (TOP) is reported. We also describe the use of these dibromoalkenes as intermediates in a one-pot route to 4,5-dihydro-1H-imidazoles and in the synthesis of bromoalkynes through MTBD-induced elimination.
One-pot conversion of activated alcohols into 1,1-dibromoalkenes and terminal alkynes using tandem oxidation processes with manganese dioxide
作者:Ernesto Quesada、Steven A. Raw、Mark Reid、Estelle Roman、Richard J.K. Taylor
DOI:10.1016/j.tet.2005.12.077
日期:2006.7
Approaches to the preparation of C1-homologated dibromoalkenes and terminal alkynes from activated alcohols using one-pot tandem oxidation processes (TOPs) with manganesedioxide are outlined. The conversion of alcohols into dibromoalkenes is described using dibromomethyltriphenylphosphonium bromide and the formation of terminal alkynes was achieved via a sequential one-pot, two-step process utilising
Copper-Catalyzed Synthesis of 4-Aryl-1H-1,2,3-triazoles from 1,1-Dibromoalkenes and Sodium Azide
作者:Xiaokun Wang、Chunxiang Kuang、Qing Yang
DOI:10.1002/ejoc.201101204
日期:2012.1
A new methodology for the Cu-catalyzed synthesis of 1H-1,2,3-triazoles from1,1-dibromoalkenes and sodiumazide is presented. Aryl dibromoolefins were efficiently converted into the corresponding 1,2,3-triazoles. A comprehensive number of functional groups were compatible with this reaction. 1,2,3-Triazoles were obtained in moderate to excellent yields.
Carbon–carbon couplings are among the most important strategies for constructing functional molecules in organic synthetic chemistry, and cheap, diverse, and readily available coupling partners are crucial to these diverse reactions. In this contribution, we report the first palladium-catalyzed C–C cross-coupling reaction of two kinds of organic halide, a gem -dibromoalkene and a halobenzene, as the