A catalytic allylic cation-induced intermolecular allylation-semipinacol rearrangement
作者:Ming-Hui Xu、Kun-Long Dai、Yong-Qiang Tu、Xiao-Ming Zhang、Fu-Min Zhang、Shao-Hua Wang
DOI:10.1039/c8cc04285c
日期:——
A catalytic intermolecular semipinacol rearrangement induced by allylic carbocations has been realized. This tandem reaction is highly efficient under the catalysis of ZnBr2, generating a wide range of α-homoallyl substituted ketones which contain all-carbon quaternary centres in good to excellent yields (up to 98%) with moderate to high diastereoselectivities (up to >20 : 1). Synthetic application
Tetrabutylammonium fluoride-induced dehydrobromination of vinyl bromides to terminal acetylenes
作者:Masaru Okutani、Yuji Mori
DOI:10.1016/j.tetlet.2007.07.174
日期:2007.9
Tetrabutylammonium fluoride (TBAF) was found to be a mild and efficient base for the dehydrobromination of vinyl bromides. Treatment of various 2-bromo-1-alkenes with TBAF·3H2O in DMF yielded terminal acetylenes in high yields without undue regard to the presence of water.