Selective palladium-catalyzed arylation(s) of benzaldehyde derivatives by N-heterocarbene ligands
作者:Nevin Gürbüz、Ismail Özdemir、Bekir Çetinkaya
DOI:10.1016/j.tetlet.2005.02.023
日期:2005.3
The 2- or 2,6-position(s) of aromatic aldehydes were directly and selectively arylated with aryl chlorides or bromides in the presence of a catalytic system prepared in situ from Pd(OAC)(2), imidazolinium chlorides (1-5) and Cs2CO3. (c) 2005 Elsevier Ltd. All rights reserved.
Use of tetrahydropyrimidinium salts for highly efficient palladium-catalyzed cross-coupling reactions of aryl bromides and chlorides
作者:Ismail Özdemir、Serpil Demir、Bekir Çetinkaya
DOI:10.1016/j.tet.2005.06.064
日期:2005.10
synthesized and characterized. These salts, in combination with palladium acetate, provided active catalysts for the cross-coupling of aryl chlorides and bromides under mild conditions. The catalytic system was applied to the Heck, Suzuki and benzaldehyde (Kumada) coupling reactions. Catalyst activity was found to be influenced by the presence of a methoxy group on the ring of the p-position of benzyl substituent