Microwave-Assisted Suzuki Coupling Reactions with an Encapsulated Palladium Catalyst for Batch and Continuous-Flow Transformations
作者:Ian R. Baxendale、Charlotte M. Griffiths-Jones、Steven V. Ley、Geoffrey K. Tranmer
DOI:10.1002/chem.200501400
日期:2006.5.24
This article describes the design, optimisation and development of a Suzuki cross-coupling protocol mediated by an efficient palladium-encapsulated catalyst (Pd EnCat) under microwave irradiation. The methodology has been used in both batch mode for classical library preparation and in continuous-flow applications furnishing multigram quantities of material. Described is a method that uses direct focused
Biaryl and Aryl Ketone Synthesis via Pd-Catalyzed Decarboxylative Coupling of Carboxylate Salts with Aryl Triflates
作者:Lukasâ J. Goossen、Christophe Linder、Nuria RodrÃguez、Paulâ P. Lange
DOI:10.1002/chem.200900892
日期:2009.9.21
the first time allows the decarboxylative cross‐coupling of aryl and acyl carboxylates with aryl triflates. In contrast to aryl halides, these electrophiles give rise to non‐coordinating anions as byproducts, which do not interfere with the decarboxylation step that leads to the generation of the carbon nucleophilic cross‐coupling partner. As a result, the scope of carboxylate substrates usable in this
Rapid threefold cross-couplings with sterically bulky triarylbismuths under Pd–Cu dual catalysis
作者:Maddali L. N. Rao、Ritesh J. Dhanorkar
DOI:10.1039/c5ra23311a
日期:——
The threefold cross-coupling reactivity of sterically highly demanding bulky triarylbismuths was addressed with task specific Pd–Cu dual catalytic conditions. In this study, an unprecedented hitherto unknown cross-coupling reactivity of sterically bulky triarylbismuths was demonstrated with a diverse range of aryl iodides and bromides. The intermediacy and in situ formation of arylcopper was probed
Synthesis, Characterization, and Catalytic Activity of Nickel(II) Alkyl Complexes Supported by Pyrrole–Diphosphine Ligands
作者:Gopaladasu T. Venkanna、Swetha Tammineni、Hadi D. Arman、Zachary J. Tonzetich
DOI:10.1021/om400630q
日期:2013.8.26
of [NiCl(P2CyPyr)] with LiHBEt3 or by reaction of H(P2RPyr) with [Ni(COD)2] (COD = 1,4-cyclooctadiene). Reactions of the methyl and hydride complexes with CO and CO2, respectively, evince clean migratory insertion chemistry of the Ni–C and Ni–H bonds. Both the alkyl and chloride complexes are active catalysts for the Kumada coupling of aryl chlorides and aryl or alkyl Grignard reagents at room temperature
基于吡咯的钳形配体 (P 2 R Pyr) - (P 2 R Pyr = 2,5-(R 2 PCH 2 ) 2 C 4 H 2 N, R = Ph, Cy)的有机金属 Ni(II) 化学被报道。格氏试剂与 [NiCl(P 2 R Pyr)] 反应生成各种烷基和芳基配合物(甲基、乙基、苄基、苯基和烯丙基),它们都显示出关于镍的方形平面几何形状。氢化物配合物 [NiH(P 2 Cy Pyr)] 也可以通过 [NiCl(P 2 Cy Pyr)] 与 LiHBEt 3 处理或通过 H(P2 R Pyr) 与 [Ni(COD) 2 ](COD = 1,4-环辛二烯)。甲基和氢化物配合物分别与 CO 和 CO 2 的反应表明 Ni-C 和 Ni-H 键具有清洁的迁移插入化学。烷基和氯化物配合物都是在室温下芳基氯化物和芳基或烷基格氏试剂的熊田偶联反应的活性催化剂。报道了几种配合物的固态结构。
Gold catalysed Suzuki-Miyaura coupling of arenediazonium o-benzenedisulfonimides
作者:Margherita Barbero、Stefano Dughera
DOI:10.1016/j.tet.2018.08.018
日期:2018.9
Arenediazonium o-benzenedisulfonimides have been used as efficient electrophilic partners in Au(I) catalysed Suzuki coupling reactions. The synthetic protocol is general, easy and produced either biaryls or heteroaryl arenes in good yields (51 positive examples, average yield 80%). o-Benzenedisulfonimide was recovered at the end of the reactions and was reused to prepare the starting salts for further