Complexation versus thiadiazole formation for reactions of thiosemicarbazides with copper(<scp>ii</scp>)
作者:Elena López-Torres、Andrew R. Cowley、Jonathan R. Dilworth
DOI:10.1039/b617186a
日期:——
The reactions of N,N-substituted thiosemicarbazides with copper salts have been investigated and either copper(II) thiosemicarbazidecomplexes, 1,3,4-thiadiazolium salts or 1,3,5-thiadiazoles are obtained depending on the Cu(II) salt and solvent used.
of dry acetonitrile at a steel grid cathode were used to promote the addition of ethyl bromoacetate to thiourea derivatives. The reaction yields the corresponding 2-imino-1,3-thiazolidin-4-one. The reaction pathway was discussed based on the kinetic and thermodynamic data obtained by computational methods. In addition, the biological activity of these new compounds was also investigated. GRAPHICAL ABSTRACT
A novel and convenient strategy is described for the regioselective conversion of N,N′-disubstituted thioureas and 1,2-dielectrophiles into the highly biologically valuable 2-imino-thiazoline and 2-imino thiazolidine-4-one derivatives. The synthesis proceeds through a process with good yield promoted by an electrogenerated base (EGB) obtained with high current efficiency.