Transformation of Β-Nitrostyrenes to Carboxylic Acids Using Amberlyst A-26 Supported Hydroperoxide
摘要:
Nitrostyrenes are conveniently converted to the corresponding carboxylic acids in high C yields at room temperature with Amberlyst A-26 supported hydroperoxide which is prepared in situ from 35% hydrogen peroxide and amberlyst A-26 (OH-).
Reducing-Agent-Free Convergent Synthesis of Hydroxyimino-Decorated Tetracyclic Fused Cinnolines via Rh<sup>III</sup>-Catalyzed Annulation Using Nitroolefins
作者:Pidiyara Karishma、Chikkagundagal K. Mahesha、Sanjay K. Mandal、Rajeev Sakhuja
DOI:10.1021/acs.joc.0c02729
日期:2021.2.5
A mild Rh-catalyzed method was developed for the synthesis of hydroxyimino functionalized indazolo[1,2-a]cinnolines and phthalazino[2,3-a]cinnolines by reductive [4 + 2] annulation between 1-arylindazolones and 2-aryl-2,3-dihydrophthalazine-1,4-diones with varied nitroolefins. The targeted oxime decorated tetracyclic fused cinnolines were synthesized via sequential C–H activation/olefin insertion/reduction
开发了一种温和的Rh催化方法,通过还原1-芳基吲唑酮和2-芳基-[4 + 2]环合反应,合成羟基亚氨基官能化的吲唑并[1,2- a ] cinnolines和邻苯并[2,3- a ] cinnolines。 2,3-二氢酞嗪-1,4-二酮与各种硝基烯烃。在无还原剂的条件下,通过连续的C–H活化/烯烃插入/还原反应,合成了目标肟肟修饰的四环稠合肉桂醛。
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
Facile Access to Challenging
<i>ortho</i>
‐Terphenyls via Merging Two Multi‐Step Domino Reactions in One‐Pot: A Joint Experimental/Theoretical Study
作者:Benedikt W. Grau、Simon Bönisch、Alexander Neuhauser、Frank Hampel、Andreas Görling、Svetlana B. Tsogoeva
DOI:10.1002/cctc.201900746
日期:2019.8.21
and materials science, but they are difficult to access. Herein, we demonstrate a straightforward and sustainable synthesis of highly functionalized ortho‐terphenyls via joining an organocatalyzed two‐step domino reaction (Knoevenagel/vinylogous Michael) with a DABCO/CuBr2 co‐catalyzed three‐step domino reaction (cyclization/tautomerization/aromatization) in a one‐pot process. Overcoming necessity to
Highly enantioselective Michael addition reactions of 2-substituted benzofuran-3(2H)-ones to nitroolefins
作者:Zhi-Pei Zhang、Nan Dong、Xin Li、Jin-Pei Cheng
DOI:10.1039/c5ob01691f
日期:——
A highly enantioselective Michaeladdition reaction of 2-substituted benzofuran-3(2H)-ones to nitroolefins was promoted by a bifunctional squaramide catalyst. As a result, a number of chiral 2,2′-substituted benzofuran-3-one derivatives, bearing adjacent quaternary–tertiary stereocenters, were efficiently synthesized with excellent enantioselectivities.