Scope and selectivity in palladium-catalyzed directed C–H bond halogenation reactions
作者:Dipannita Kalyani、Allison R. Dick、Waseem Q. Anani、Melanie S. Sanford
DOI:10.1016/j.tet.2006.06.075
日期:2006.12
Palladium-catalyzed ligand directed C–H activation/halogenation reactions have been extensively explored. Both the nature of the directing group and the substitution pattern on the arene ring of the substrate lead to different reactivity profiles, and often different and complementary products, in the presence and absence of the catalyst.
A rhodium(III)‐catalyzed direct ortho CH bond olefination of arenes, including but not limited to benzamides, arylpyridines and indoles, with a variety of unactivated aliphatic olefins has been developed. In the presence of catalytic amounts of dichloro(pentamethylcyclopentadienyl)rhodium(III) dimer [Cp*RhCl2]2}, copper(II) acetate monohydrate [Cu(OAc)2⋅H2O] and silver hexafluoroantimonate(V) (AgSbF6)
Sulfination by Using Pd-PEPPSI Complexes: Studies into Precatalyst Activation, Cationic and Solvent Effects and the Role of Butoxide Base
作者:Mahmoud Sayah、Alan J. Lough、Michael G. Organ
DOI:10.1002/chem.201203142
日期:2013.2.18
The activation of PEPPSI precatalysts has been systematically studied in Pd‐catalysed sulfination. Under the reactions conditions of the sulfide and KOtBu in toluene, the first thing that happens is exchange of the two chlorides on the PEPPSI precatalyst with the corresponding sulfides, creating the first resting state; it is via this complex that all Pd enters the catalytic cycle. However, it is also
A P,N-Ligand for Palladium-Catalyzed Ammonia Arylation: Coupling of Deactivated Aryl Chlorides, Chemoselective Arylations, and Room Temperature Reactions
作者:Rylan J. Lundgren、Brendan D. Peters、Pamela G. Alsabeh、Mark Stradiotto
DOI:10.1002/anie.201000526
日期:2010.6.1
Amazing ammonia: A new air‐stable P,N‐ligand (Mor‐DalPhos) is reported that enables the palladium‐catalyzed cross‐coupling of ammonia to a variety of aryl chloride and aryl tosylate substrates with high chemoselectivity and, for the first time, at room temperature (see scheme; Ad=adamantyl, Ts=para‐toluenesulfonyl).
惊人的氨气:据报道,一种新型的空气稳定的P,N-配体(Mor-DalPhos)使钯催化的氨气与多种具有高化学选择性的芳基氯和甲苯磺酸芳基酯的交叉偶联成为首次。 ,在室温下(参见方案; Ad =金刚烷基,Ts =对甲苯磺酰基)。