Calcium(II)-Catalyzed Intermolecular Hydroarylation of Deactivated Styrenes in Hexafluoroisopropanol
作者:Chenxiao Qi、Vincent Gandon、David Lebœuf
DOI:10.1002/anie.201809470
日期:2018.10.22
A challenging catalytic hydroarylation of highly electron deficient styrenes has been developed on the basis of efficient cooperation between a calcium(II) triflimide salt and hexafluoroisopropanol (HFIP). This method affords a large variety of diaryl alkanes, notably diaryl ethanes, in good to excellent yields, and is simple to implement and compatible with various functional groups. Furthermore,
A reductive cross coupling reaction process for functionalization of a nucleophilic alkene can be achieved. The nucleophilic alkene and a nucleophilic cross coupling partner compound can be reacted in the presence of an oxidizable alcohol and a suitable catalyst to form a reductive coupling product. Various additives can also be useful to refine the process such as by mitigating certain undesirable intermediates, facilitating specific site selectivity for various substitutions or reaction sites, etc. Chiral additives can be optionally used which act to provide asymmetric catalysis, e.g. allow for regioselective and stereoselective production of reductive coupling products. A reductive cross coupling pathway can include oxidizing the oxidizable alcohol to form a catalyst hydride. The nucleophilic alkene can be inserted into the catalyst hydride to form a catalyst-alkyl intermediate. Further, the catalyst-alkyl intermediate can be transmetallized with the nucleophilic cross coupling partner compound to form a transmetallated intermediate. The catalyst can be reductively eliminated to form the reductive coupling product and a reduced catalyst. Finally, the reduced catalyst can be oxidized under aerobic conditions, for example with oxygen, to form the oxidized catalyst and subsequent repetition through the cyclic pathway.
Palladium-Catalyzed Reductive Coupling of Styrenes and Organostannanes under Aerobic Conditions
作者:Keith M. Gligorich、Sarah A. Cummings、Matthew S. Sigman
DOI:10.1021/ja076746f
日期:2007.11.1
We report a highly regioselective PdII-catalyzed reductive coupling of an alkene with an organostannane using a tandem alcohol oxidation under aerobic conditions. Both aryl- and vinylstannanes are competent coupling partners with a variety of styrene derivatives. Mechanistic experiments support a tandem alcohol oxidation/alkene functionalization process. The ability to trap a palladium hydride derived
we describe an activation mode for unactivated alkenes on the basis of a synergy between Re2O7/HReO4 and hexafluoroisopropanol (HFIP). Highly electron-deficient styrenes have been activated to effect a challenging intermolecular hydroarylation with different arenes to give a variety of diarylalkanes in high efficiency. This method is characterized by mild reaction condition, broad substrate scope, high
在这里,我们描述了基于 Re 2 O 7 /HReO 4之间的协同作用的未活化烯烃的活化模式和六氟异丙醇 (HFIP)。高度缺电子的苯乙烯已被激活,以实现具有挑战性的分子间加氢芳基化,以高效地产生各种二芳基烷烃。该方法具有反应条件温和、底物范围广、化学收率高、产生的废物少等特点。这种方法的潜在合成应用以维甲酸受体 (RAR) 激动剂的有效合成为例。进行了 DFT 计算和氘标记实验以阐明反应机理,两者都证实了 HFIP 的关键作用,它通过与两个当量HFIP。
Mechanistically guided development of homogenous nickel catalysis through rapid computational catalyst screening