以市售天然氨基酸(L-Val、L-Leu、L-Phe)为手性前体,通过氨基酸、甲醛、乙二醛、氨的缩合反应合成了一系列含有手性基团的N-取代咪唑衍生物. 通过酯化、还原、氯化以及随后的硫醇取代,合成了含有咪唑环的手性硫醚,并优化了合成条件。所有中间体和最终产物均通过 NMR、ESI MS、HR MS 和 IR 进行表征。
Chelating palladium complexes containing pyridine/pyrimidine hydroxyalkyl di-functionalized N-heterocyclic carbenes: synthesis, structure, and catalytic activity towards C–H activation
作者:Liangru Yang、Jinwei Yuan、Pu Mao、Qi Guo
DOI:10.1039/c5ra21183b
日期:——
novel chelating palladium complexes containing pyridine/pyrimidine hydroxyalkyl di-functionalized N-heterocyclic carbenes (NHCs) via direct metallation of the precursor imidazolium salts is presented. The structure has been characterized unambiguously by X-ray single crystal analysis. Catalytic activity investigation showed that the complexes catalyse the direct C–H bond arylation of (benzo)oxazoles efficiently
Catalytic activity of chelating N-heterocyclic carbene palladium complexes towards selective phosphorylation of coumarins
作者:Liangru Yang、Xinchi Zhang、Jinwei Yuan、Yongmei Xiao、Pu Mao
DOI:10.1016/j.jorganchem.2016.06.015
日期:2016.9
The catalyticactivity of a series of heteroaryl coordinated chelating N-heterocyclic carbene (NHC) palladium complexes bearing different N-substituents, NHC backbones and chelating rings towards the phosphorylation of coumarins, and the relationship between the activity and the structure are presented. The results showed that the chelating NHC palladium complex Ia–b bearing the most σ-donating backbone