The
cis,cis,cis-1,2,3,4-tetrakis(diphenylphosphinomethyl)-cyclopentan
e/[PdCl(C3H5)]2 system catalyses allylic
amination in good yields with a very high substrate/catalyst ratio; a
turnover number of 680 000 and a turnover frequency of 8125
h−1 can be obtained for the addition of dipropylamine to
allyl acetate in the presence of this catalyst.
Pickering Emulsion-Derived Liquid–Solid Hybrid Catalyst for Bridging Homogeneous and Heterogeneous Catalysis
作者:Xiaoming Zhang、Yiting Hou、Rammile Ettelaie、Ruqun Guan、Ming Zhang、Yabin Zhang、Hengquan Yang
DOI:10.1021/jacs.8b11860
日期:2019.4.3
method to prepare a liquid-solid hybrid catalyst via interfacial growth of a porous silica crust around Pickering emulsion droplets, which allowed us to overcome the current limitations of both homogeneous and heterogeneous catalysts. The inner micron-scaled liquid (for example, ionic liquids) pool of the resultant catalyst can host free homogeneous molecular catalysts or enzymes to create a true homogeneous
Allylic Amination via Decarboxylative C-N Bond Formation
作者:Jon A. Tunge、Shelli R. Mellegaard-Waetzig、Dinesh Kumar Rayabarapu
DOI:10.1055/s-2005-918949
日期:——
This manuscript details the development of a palladium-catalyzed allylic amination that proceeds via decarboxylation of allylic carbamates. Both saturated and aromatic heterocycles undergo decarboxylative rearrangement in good yields. The mechanism of allylation of heteroaromatic amines involves the formation of Ï-allyl palladium complexes followed by decarboxylation of the carbamate. Finally, the heteroaromatic anion equivalent is allylated to provide allylic amines.
Abstract Catalysts containing an ionicliquidphaseimmobilised on chitosan or alginate supports are successfully applied to the palladium catalysed allylation and amination reactions. The influence of the chemical structure of the support not only on the activity, but also on the recyclability and the reusability of the catalyst, is evaluated.
Allylic Amination Using Well‐Defined [(NHC)Pd(η
<sup>3</sup>
‐allyl)Cl] Complexes and PPh
<sub>3</sub>
作者:Sylvain Roland、William Cotet、Pierre Mangeney
DOI:10.1002/ejic.200801157
日期:2009.5
at the allyl fragment. This reaction occurs exclusively in the presence of PPh3, thus suggesting that cationic [(NHC)Pd(allyl)(PPh3)]+ complexes, which are more electrophilic, are formed in situ and allow the amine to react with the allyl fragment. A tetrafluoroborate cationic complex has therefore been prepared from [(NHC)Pd(allyl)Cl], PPh3, and AgBF4 and fully characterized. This complex is an active
研究了 [(NHC)Pd(allyl)Cl] 配合物催化的烯丙基胺化反应,发现 PPh3 的存在对于催化体系的活性至关重要。 [(1-Mesityl-3-methylimidazol-2- ylidene)Pd(η3-C3H5)Cl] 已用于优化与 (E)-1,3-diphenylprop-3-enyl 乙酸酯和苄胺在双相条件(碱水/CH2Cl2)下的反应条件。使用 1 M K2CO3 水溶液获得分离产物的最佳产率 (98%)。还检查了 NHC 配体和烯丙基片段对预催化剂的影响。两种新的中性 [(NHC)Pd(η3-1-RC3H4)Cl] 配合物 [NHC = 1-mesityl-3-methylimidazol-2-ylidene or 1-(2,6-diisopropylphenyl)-3-methylimidazol-2-ylidene ; R = H 或 Ph] 已制备,使用前者观察到反应时间减少。NMR