Conversion of Bromoalkenes into Alkynes by Wet Tetra-n-butylammonium Fluoride
摘要:
Tetra-n-butylammonium fluoride was found to be a mild and efficient base for the elimination reaction of bromoalkenes. Treatment of 1,1-dibromoalkenes, (Z)-1-bromoalkenes, and internal bromoalkenes with 5 equiv of TBAF center dot 3H(2)O in DMF yielded terminal and internal alkynes in high yields without undue regard to the presence of water.
Tellurium-promoted stereoselective hydrodebromination of 1,1-dibromoalkenes: synthesis of (E)-bromoalkenes
作者:Gelson Perin、Angelita M. Barcellos、Thiago J. Peglow、Patrick C. Nobre、Roberta Cargnelutti、Eder J. Lenardão、Francesca Marini、Claudio Santi
DOI:10.1039/c6ra24295b
日期:——
We describe herein an efficient and simple method to the stereoselective hydrodebromination of 1,1-dibromoalkenes by using a catalytic amount of the nucleophilic species of tellurium, generated in situ by the...
A convenient synthesis of 1-bromoolefins and acetylenes by a chain extension of aldehydes
作者:Masakatsu Matsumoto、Keiko Kuroda
DOI:10.1016/s0040-4039(00)92860-0
日期:1980.1
Aldehydes are easily converted to 1-bromoolefins or terminal acetylenes by the use of Wittig reaction of bromomethylenetriphenylphosphorane which is prepared from bromomethyltriphenylphosphonium bromide with potassium tert-butoxide.