作者:Pei-Hua Liu、Lei Li、Jeffrey A. Webb、Yi Zhang、Nancy S. Goroff
DOI:10.1021/ol049734x
日期:2004.6.1
Tetrabromobutatriene, C4Br4, can be prepared directly from dibromobutadiyne by reaction with Br-2 at -25 degreesC in concentrated hexanes solution. The cumulene precipitates out of the reaction mixture as a yellow powder. Under palladium-catalyzed coupling conditions, C4Br4 can undergo allylic rearrangement, giving a mixture of products, including some with butenyne backbones. However, in furan solution, C4Br4 reacts cleanly at its central double bond to give the furan Diels-Alder adduct. Under Suzuki conditions, this adduct reacts at the furan double bond rather than at bromide.