Unsaturated eight-membered ring compounds. X. 1,2,3,4,7-cyclooctapentaene, a possible intermediate in the conversion of cis,cis-3,5-octadiene-1,7-diyne to benzocyclobutadiene dimer
Unsaturated eight-membered ring compounds. X. 1,2,3,4,7-cyclooctapentaene, a possible intermediate in the conversion of cis,cis-3,5-octadiene-1,7-diyne to benzocyclobutadiene dimer
Copper catalyzed regioselective coupling of allylic halides and alkynes promoted by weak inorganic bases
作者:Lothar W. Bieber、Margarete F. da Silva
DOI:10.1016/j.tetlet.2007.08.010
日期:2007.10
Allylichalides and terminal alkynes couple under CuI catalysis in DMSO or DMF solution. In most cases, sodium carbonate or bicarbonate is sufficient to promote the reaction; less reactive alkynes require catalytic amounts of DBU. Bifunctional alkynes and halides can be reacted selectively according to the stoichiometry used. Trimethylsilyl, hydroxyl, ester and halide groups are tolerated in the alkyne