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
An unprecedented approach to isoxazoline aldoximes via the reactions of nitromethane and olefins is achieved. Nitromethane is electrochemically activated to serve as both the heterocyclic skeleton and oxime sources for the construction of isoxazoline aldoximes.
The first example of an efficient DBU/iron co-catalyzed three-component perfluoroalkylvinylation of alkenes has been reported through a radical process under mild conditions.
Site‐Fixed Hydroboration of Terminal and Internal Alkenes using BX
<sub>3</sub>
/
<sup>
<i>i</i>
</sup>
Pr
<sub>2</sub>
NEt**
作者:Sida Li、Chenyang Hu、Xin Cui、Jiong Zhang、Liu Leo Liu、Lipeng Wu
DOI:10.1002/anie.202111978
日期:2021.12.6
A novel and general method for the hydroboration of alkenes, including arylalkenes, 1,1-disubstitutedalkenes, aliphatic alkenes, and bio-derived alkenes, using BX3 as the boration reagent in the presence of iPr2NEt is reported. The reaction was also applied to the synthesis of linear and branched 1,n-diborylalkanes. The reaction is thought to proceed by a frustrated Lewis pair type single-electron-transfer