Efficient Aerobic Wacker Oxidation of Styrenes Using Palladium Bis(isonitrile) Catalysts
作者:Anu Naik、Liu Meina、Manfred Zabel、Oliver Reiser
DOI:10.1002/chem.200901560
日期:2010.2.1
The palladium‐catalyzed aerobicoxidation of alkenes and especially styrenes (Wackeroxidation) by using chiral pseudo C2‐symmetrical bis(isonitrile) ligands in the absence of further cocatalysts gives rise to methyl ketones in a highly chemoselective manner. The palladiumbis(isonitrile) catalyst was characterized by NMR spectroscopy and X‐ray structure analysis, revealing a dissymmetric coordination
Trifluoromethylchlorosulfonylation of Alkenes: Evidence for an Inner-Sphere Mechanism by a Copper Phenanthroline Photoredox Catalyst
作者:Dattatraya B. Bagal、Georgiy Kachkovskyi、Matthias Knorn、Thomas Rawner、Bhalchandra M. Bhanage、Oliver Reiser
DOI:10.1002/anie.201501880
日期:2015.6.8
A visible‐light‐mediated procedure for the unprecedented trifluoromethylchlorosulfonylation of unactivated alkenes is presented. It uses [Cu(dap)2]Cl as catalyst, and contrasts with [Ru(bpy)3]Cl2, [Ir(ppy)2(dtbbpy)]PF6, or eosin Y that exclusively give rise to trifluoromethylchlorination of the same alkenes. It is assumed that [Cu(dap)2]Cl plays a dual role, that is, acting both as an electron transfer
Synthesis of New Chiral Bidentate Isonitrile–Acyclic Diaminocarbene Palladium(II) Compounds and Their Catalytic Activity
作者:Matthias Knorn、Eugen Lutsker、Oliver Reiser
DOI:10.1021/acs.organomet.5b00516
日期:2015.9.28
Five new chiral bidentate isonitrile diamino-carbene palladium(II) complexes (5a-5e) as well as the bis-diaminocarbene complex 6 were prepared by metal-mediated nucleophilic addition of amines to the corresponding bisisonitrile palladium(II) compound 4. The new chelates were fully characterized by 1D and 2D NMR experiments, IR, and ESI-MS. In addition, the X-ray structure of 5a, 5c, and 6 could be analyzed, showing different sterical properties. We furthermore investigated the relationship between their structure and their catalytic activity. The mixed ligand complexes 5a and 5c showed high activity both in Suzuki-Miyaura cross-coupling and in intermolecular asymmetric allylic alkylation (AAA) reactions as well as moderate chiral induction in the AAA.