A metal-free CC bond cleavage reaction of β-nitrostyrenes in the presence of elemental sulfur and secondary amines/amides is described. Elemental sulfur serves as both a raw material and an oxidant for CC bond cleavage, and secondary amines or amides are both feasible nitrogen sources. Besides mild reaction condition and simple work-up procedure, the method provided thioamides with good to excellent
描述了在元素硫和仲胺/酰胺存在下 β-硝基苯乙烯的无金属 C C 键裂解反应。元素硫既是C C 键断裂的原料又是氧化剂,仲胺或酰胺都是可行的氮源。除了温和的反应条件和简单的后处理程序外,该方法还提供了具有良好收率的硫代酰胺。
Ce(<scp>iii</scp>)-catalyzed highly efficient synthesis of pyridyl benzamides from aminopyridines and nitroolefins without external oxidants
作者:Zhengwang Chen、Xiaowei Wen、Yiping Qian、Pei Liang、Botao Liu、Min Ye
DOI:10.1039/c7ob03113k
日期:——
An efficient Ce(iii)-catalyzed synthesis of amides and oxazolo[4,5-b]pyridines from 2-aminopyridines and nitroolefins via CC bond cleavage has been developed.
Use of a Traceless Activating and Directing Group for the Construction of Trifluoromethylpyrazoles: One-Pot Transformation of Nitroolefins and Trifluorodiazoethane
作者:Zhen Chen、Yan Zheng、Jun-An Ma
DOI:10.1002/anie.201700955
日期:2017.4.10
We disclose an efficient one‐pot transformation of trifluorodiazoethane and higher perfluorinated homologues with various nitroolefins. This method takes advantage of the nitro group as a traceless activating and directing group (TADG) that is released in the aromatization step to produce 4‐substituted 3‐perfluoroalkyl pyrazoles with complete regioselectivity. The potential of this method is further
Enantioselective Michael Addition Reaction Catalysed by Enantiopure Binuclear Nickel(II) Close‐Ended Helicates
作者:Eswaran Chinnaraja、Rajendran Arunachalam、Krishanu Samanta、Ramalingam Natarajan、Palani S. Subramanian
DOI:10.1002/adsc.201901350
日期:2020.3.4
The enantiopure Ni(II) helicates [Ni2L1RR.Cl2] (1), [Ni2L1SS.Cl2] (1′), [Ni2L2RR.Cl2] (2), [Ni2L2SS.Cl2] (2′) were synthesized by one‐pot self‐assembly technique from R‐(+)‐ or S‐(−)‐1,1′‐binaphthyl‐2,2′‐diamine, with 4‐methyl‐2,6‐diformyl phenol or 4‐tert‐butyl‐2,6‐diformyl phenol and nickel salts. This binuclear double stranded Ni(II) helicates were characterized by ESI‐MS, IR and single crystal
的对映体纯的Ni(II)helicates [倪2大号1 RR .CL 2 ](1),[倪2大号1 SS .CL 2 ](1' ),[倪2大号2 RR .CL 2 ](2), [Ni 2 L 2 SS .Cl 2 ](2')是通过一锅自组装技术由R -(+)-或S -(-)-1,1'-联萘-2,2'-合成的二胺,与4-甲基-2,6-二甲酰基苯酚或4-叔丁基-2,6-丁基-二甲酰基苯酚和镍盐。这种双核双链Ni(II)螺旋结构在适用的情况下通过ESI-MS,IR和单晶X射线结构表征。大量的手性研究表明,该络合物在本质上是对映纯的。从配体L 1 RR和L 2 RR到Ni(II)金属中心的手性转移产生了ΔΔ几何手性,而它们的对映体对应物L 1 SS和L 2 SS 这些对映体纯的螺旋产物被用作催化剂,将1,3-二羰基化合物与β-硝基苯乙烯不对称迈克尔加成,以高产率(96-98%)和ee(78-94%)生产硝基烷。
Metal-free ring expansion of indoles with nitroalkenes: a simple, modular approach to 3-substituted 2-quinolones
作者:Alexander V. Aksenov、Alexander N. Smirnov、Nicolai A. Aksenov、Inna V. Aksenova、Jonathon P. Matheny、Michael Rubin
DOI:10.1039/c4ra14406f
日期:——
3-Substituted 2-quinolones are obtained via a novel metal-free transannulation reaction of 2-nitroolefins with 2-substitutedindoles in polyphosphoric acid. This acid-mediated cascade transformation operates via the ANRORC (Addition of Nucleophile, Ring Opening, and Ring Closure) mechanism and can be used in combination with the Fisher indole synthesis to offer a practical three-component hetero-annulation