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S: An Alternative Hydride Source for NiH‐Catalyzed Reductive Migratory Hydroarylation and Hydroalkenylation of Alkenes
作者:Jiandong Liu、Hegui Gong、Shaolin Zhu
DOI:10.1002/ejoc.202100005
日期:2021.3.12
The inexpensive borane dimethylsulfide (BMS) complex was found to be an efficient hydride source for nickel‐hydride catalyzed migratory hydrofunctionalization. Using BMS, migratory hydroarylation and migratory hydroalkenylation were achieved with broad substrate scope under mild conditions.
Heterodimerization of Olefins. 1. Hydrovinylation Reactions of Olefins That Are Amenable to Asymmetric Catalysis
作者:T. V. RajanBabu、Nobuyoshi Nomura、Jian Jin、Malay Nandi、Haengsoon Park、Xiufeng Sun
DOI:10.1021/jo035171b
日期:2003.10.1
counteranion (BARF or SbF6) in an enantioselective version of the Ni-catalyzed reaction raises the prospects of developing a practical route for the synthesis of 3-arylbutenes. Several pharmaceutically relevant compounds, including widely used 2-arylpropionic acids, can be synthesized from these key intermediates. This reaction appears to be quite general. Synthesis of several new 2-diphenylphosphino-1
通过对配体和抗衡离子作用的系统检查,发现了用于乙烯和各种功能化乙烯基芳烃的近定量和高度选择性共聚的新方案。在典型的反应中,在-56℃下,在[CH2Cl2]中,在[CH3Cl2]中分别存在0.0035当量的[(烯丙基)NiBr] 2,三苯膦和AgOTf,4-溴苯乙烯和乙烯进行共二聚,得到3-(4-溴苯基)-1 -丁烯的收率和选择性均> 98%。与[(烯丙基)PdX] 2的相应反应效率低下且选择性低,在鉴定出可行的系统之前可能需要进一步优化。产生可比的产率和选择性的另一有用方案涉及使用由2-二苯基膦基苯甲酸烯丙酯,Ni(COD)2和(C 6 F 5)3 B制备的单组分催化剂。识别手性半不稳定配体(例如,(R)-2-甲氧基-2'-二苯基膦基-1,1'-联萘基,MOP)与高度离解的抗衡阴离子(BARF或SbF6)之间的协同关系Ni催化的反应的发展提出了开发合成3-芳基丁烯的实用路线的前景。可以从这
Heterodimerization of Propylene and Vinylarenes: Functional Group Compatibility in a Highly Efficient Ni-Catalyzed Carbon–Carbon Bond-Forming Reaction
作者:Jian Jin、T.V. RajanBabu
DOI:10.1016/s0040-4020(99)01097-2
日期:2000.4
Unlike heterodimerization reactions of ethylene and vinylarenes, no such synthetically useful reactions using propylene are known. We find that propylene reacts with various vinylarenes in the presence of catalytic amounts of [(allyl)NiBr]2, triphenylphosphine and AgOTf giving excellent yields of the dimerization products. The reaction proceeds at 1 atm of propylene at temperatures between −15 and 10°C
intermediate (phenonium character), particularly with electron-donating substituents on the aromatic ring, and the main products in acetonitrile are phenethyl chlorides. Variation of the ion-stabilizing solvent such as trifluoroethanol (TFE) leads to alkyl and hydride migration before chloride addition. In contrast, with less electron-rich aromatics and highly substituted alkenes the stabilization of the intermediate
Contra-Thermodynamic Positional Isomerization of Olefins
作者:Kuo Zhao、Robert R. Knowles
DOI:10.1021/jacs.1c11681
日期:2022.1.12
affords an isomerized and less thermodynamically stable alkene product. The higher oxidation potential of the less substituted olefin isomer renders it inert to further oxidation by the excited-state oxidant, enabling it to accumulate in solution over the course of the reaction. A broad range of isopropylidene substrates are accommodated, including enol ethers, enamides, styrenes, 1,3-dienes, and tetrasubstituted