tetratriazolium salt and its subsequent metalation to generate a series of tetranuclear mesoioniccarbenegold(I) complexes is presented. The complete structural characterization of the metallic carbenes and the benefits of cooperative catalysis in the processes of hydroamination and hydrohydrazination of terminal alkynes are discussed.
characterization of a novel series of ring‐fused benzoxazine‐derived triazolium salts (1a–c) and their corresponding triazolylidene gold(I) complexes (2a–c). All new compounds were fully characterized by means of 1H and 13C NMR spectroscopy, elemental analyses, and mass spectroscopy and in the case of triazoliums 1a and 1b by single‐crystal X‐ray diffraction. The new triazolylidene gold complexes (2a–c)
我们报道了一系列新的环稠合苯并恶嗪衍生的三唑盐(1a–c)及其相应的三唑基亚金(I)配合物(2a–c)的合成和完整表征。通过1 H和13 C NMR光谱,元素分析和质谱对所有新化合物进行充分表征,对于三唑鎓1a和1b,则通过单晶X射线衍射对其进行充分表征。在苯炔衍生物和肼为氮源的末端炔烃的加氢胺化和氢肼化反应中,新的三唑基亚金络合物(2a–c)作为预催化剂进行了测试。
Eosin‐Y‐Catalyzed Photoredox C−S Bond Formation: Easy Access to Thioethers
An operationally simple EosinYcatalyzed sulfenylation of hydrazones has been realized to afford a range of thioethers under visible light. The methodology provides high yields of thioethers under ambient conditions employing readily available and inexpensive starting materials. The reaction has broad substrate scope and is compatible with various functional groups.
Lewis acid-promoted direct synthesis of N-unsubstituted hydrazones via the reaction of hydrazine with acetophenone and isatin derivatives
作者:A. S. El-Azab、H. A. Ghabbour、W. M. El-Husseiny、A. R. Maarouf、M. A. Mohamed、A. A.-M. Abdel-Aziz
DOI:10.1134/s1070363216120471
日期:2016.12
Hydrazones 2–22 were synthesized via the reaction of acetophenone with isatin derivatives and anhydrous hydrazine promoted by BF3 as a Lewis acid at 0°C. Structures of the synthesized hydrazones were determined on the basis of NMR and X-ray crystallographic analyses.
A novel strategy for the crossdehydrogenativecoupling (CDC) of acetophenone hydrazones and aldehydes has been developed for the synthesis of highly substituted pyrazoles. This work, for the first time, uses elemental sulfur as a promoter as well as a hydrogen acceptor in effecting the Csp(3)-Csp(2) bond formation via C-H activation.