A novel method for the oxidation of thiophenes. Synthesis of thiophene 1,1-dioxides containing electron-withdrawing substituents
作者:V. G. Nenajdenko、A. M. Moiseev、E. S. Balenkova
DOI:10.1007/s11172-005-0107-9
日期:2004.10
A novel method for the synthesis of thiophene 1,1-dioxides by oxidation of substituted thiophenes with trifluoroperoxyacetic acid was developed. The effect of the solvent nature on the course of the reaction was studied and optimum conditions for the oxidation of thiophenescontaining various functional groups were found. Previously unknown thiophene dioxides were obtained.
作者:Barry M. Trost、Veronika Ehmke、B. Michael O’Keefe、Dustin A. Bringley
DOI:10.1021/ja5044825
日期:2014.6.11
exclusive formation of the dearomatized alicyclic products without subsequent rearomatization. The reaction is tolerant toward a broad range of heterocyclic and benzenoid substrates. The use of chiral bisdiamidophosphite ligands enabled the development of an enantioselective variant of this transformation, representing one of the rare examples of an asymmetric catalyticdearomatization process.
ions. Such a ranking holds promise for expanding the range of couplingreactions which can be envisioned with such strongly electron-deficient neutral heteroaromatics as nitrobenzofuroxans and related compounds. Arguments are also given which exclude the possibility for the reactions studied to proceed via an electron-transfer mechanism.
Studies on the biological activity of some nitrothiophenes
作者:John O. Morley、Thomas P. Matthews
DOI:10.1039/b514441h
日期:——
inhibitory concentration required to inhibit the growth of E. coli, M. luteus and A. niger. The series displays a wide range of activities with 2-chloro-3,5-dinitrothiophene (3a) or 2-bromo-3,5-dinitrothiophene (3c) showing the highest activity against all three organisms, while the simplest compound of the series, 2-nitrothiophene (3s) shows the smallest activity in each case. The mode of action of 3a and
terms of Brønsted relationships reveals that the reaction mechanism likely involves a single‐electrontransfer (SET) process. The excellent correlations upon plotting the rate constants versus the oxidation potentials Eo values is an additional evidence that reactions between thiophenes and phenoxide anions are proceeding through an initial electrontransfer. It is of particular interest to note that the