Efficient synthesis of 1,3,4-thiadiazoles using hydrogen bond donor (thio)urea derivatives as organocatalysts

摘要

(Chemical Equation Presented) A simple and efficient procedure for the synthesis of 1,3,4-thiadiazoles has been achieved using thiourea as organocatalyst. In this study, the steric and electronic effects using structurally different derivatives of urea and thiourea in different solvents were evaluated. The best yields and the rate of the reactions were obtained using 30 mol % of thiourea as catalyst in acetonitrile at room temperature. The molecular structures of the products were established by ~1H and ~(13)C NMR spectral data.