Metal and base-free synthesis of arylselanyl anilines using glycerol as a solvent
作者:S. Thurow、F. Penteado、G. Perin、R. G. Jacob、D. Alves、E. J. Lenardão
DOI:10.1039/c4gc00874j
日期:——
We describe here a metal and base-free straightforward method to access arylselanyl anilines using glycerol as a solvent. Starting from N,N-disubstituted anilines and arylselanyl chloride, the protocol is general and was successfully applied to a sort of anilines with different substitution patterns in both the aromatic ring and the nitrogen atom. As desirable for a green synthetic procedure, the non-toxic, low volatile, renewable glycerol was used as a solvent at room temperature.
Chalcogen–Chalcogen Bonding Catalysis Enables Assembly of Discrete Molecules
作者:Wei Wang、Haofu Zhu、Shuya Liu、Zhiguo Zhao、Liang Zhang、Jingcheng Hao、Yao Wang
DOI:10.1021/jacs.9b03806
日期:2019.6.12
X-ray crystal structures, catalysis that harnesses the power of such chalcogen-chalcogen bonding interactions to produce advanced molecules remains an unresolved problem. Here, we show that a class of extraordinary chalcogen-bonding catalysts enables assembly of discrete small molecules including three β-ketoaldehydes and one indole, leading to the construction of N-heterocycles in a highly efficient manner
尽管观察到 X 射线晶体结构中硫属元素原子之间的非共价相互作用,利用这种硫属元素-硫属元素键合相互作用的力量来产生高级分子的催化作用仍然是一个悬而未决的问题。在这里,我们展示了一类非凡的硫属键合催化剂能够组装离散的小分子,包括三个 β-酮醛和一个吲哚,从而以高效的方式构建 N-杂环。这些设计合理的催化剂的强大活化能力为硫属元素键合催化的内在局限性提供了通用的解决方案。
Synthesis of diaryl selenides using electrophilic selenium species and nucleophilic boron reagents in ionic liquids
作者:Camilo S. Freitas、Angelita M. Barcellos、Vanessa G. Ricordi、Jesus M. Pena、Gelson Perin、Raquel G. Jacob、Eder J. Lenardão、Diego Alves
DOI:10.1039/c1gc15725f
日期:——
We described herein the use of imidazolium ionic liquids [bmim]PF6 and [bmim]BF4 in the selective, metal and catalyst-free synthesis of unsymmetrical diaryl selenides by electrophilic substitution in arylboron reagents with arylselenium halides (Cl and Br) at room temperature. This is a general substitution reaction and it was performed with arylboronic acids or potassium aryltrifluoroborates bearing