Nitroepoxides as Versatile Precursors to 1,4-Diamino Heterocycles
摘要:
Nitroepoxides are easily transformed into 1,4-diamino heterocycles such as quinoxalines and pyrazines by treatment with 1,2-benzenediamines and ammonia, respectively. Additionally, related saturated heterocycles, such as piperazines and tetrahydroquinoxalines, can be accessed by treatment with 1,2-diamines and a reducing agent. These transformations are efficient, provide access privileged, bioactive structures, and produce minimal waste.
Direct C−H Arylation of Electron-Deficient Heterocycles with Arylboronic Acids
作者:Ian B. Seiple、Shun Su、Rodrigo A. Rodriguez、Ryan Gianatassio、Yuta Fujiwara、Adam L. Sobel、Phil S. Baran
DOI:10.1021/ja1066459
日期:2010.9.29
A directarylation of a variety of electron-deficientheterocycles with arylboronic acids has been developed. This new reaction proceeds readily at room temperature using inexpensive reagents: catalytic silver(I) nitrate in the presence of persulfate co-oxidant. The scope with respect to heterocycle and boronic acid coupling partner is broad, and sensitive functional groups are tolerated. This method
A Highly<i>cis</i>-Selective and Enantioselective Metal-Free Hydrogenation of 2,3-Disubstituted Quinoxalines
作者:Zhenhua Zhang、Haifeng Du
DOI:10.1002/anie.201409471
日期:2014.11.13
A wide range of 2,3‐disubstituted quinoxalines have been successfully hydrogenated with H2 using borane catalysts to produce the desired tetrahydroquinoxalines in 80–99 % yields with excellent cis selectivity. Significantly, the asymmetric reaction employing chiral borane catalysts generated by the in situ hydroboration of chiral dienes with HB(C6F5)2 under mild reaction conditions has also been achieved
使用硼烷催化剂已成功地将多种2,3-二取代的喹喔啉用H 2氢化,以80-99%的产率产生所需的四氢喹喔啉,并具有出色的顺式 选择性。值得注意的是,在温和的反应条件下,采用手性二硼烷与HB(C 6 F 5)2进行手性二烯氢硼化生成的手性硼烷催化剂的不对称反应也达到了96%ee,这是第一个催化不对称体系。提供光学活性的顺式-2,3-二取代的1,2,3,4-四氢喹喔啉。
Electrochemical Arylation of Electron‐Deficient Arenes through Reductive Activation
作者:Pan Wang、Zhenlin Yang、Ziwei Wang、Chenyang Xu、Lei Huang、Shengchun Wang、Heng Zhang、Aiwen Lei
DOI:10.1002/anie.201909600
日期:2019.10.28
An electrochemical method has been developed to achieve arylation of electron-deficientarenes through reductive activation. Various electron-deficientarenes and aryldiazonium tetrafluoroborates are amenable to this transformation within the conditions of an undivided cell, providing the desired products in up to 92 % yield. Instead of preparing diazonium reagents, these reactions can begin from anilines
Metal free C–H functionalization of diazines and related heteroarenes with organoboron species and its application in the synthesis of a CDK inhibitor, meriolin 1
作者:Thanusha Thatikonda、Umed Singh、Srinivas Ambala、Ram A. Vishwakarma、Parvinder Pal Singh
DOI:10.1039/c6ob00526h
日期:——
Here, we report a metal-free cross-coupling reaction of diazines and related heteroarenes with organoboron species.
Highly efficient vinylaromatics generation via iron-catalyzed sp3 C–H bond functionalization CDC reaction: a novel approach to preparing substituted benzo[α]phenazines
An iron-catalyzed benzylic vinylation was developed to transfer the carbon atom in the N,N-dimethyl moiety of N,N-dimethylacetamide (or N,N-dimethylformamide) to 2-methyl azaarenes to generate 2-vinyl azaarenes.