Rhodanine and its derivatives have been known as privileged structures in pharmacological
research because of their wide spectrum of biological activities, but the synthesis
method of rhodanine skeleton is limited. In this paper, not only rhodanine skeleton,
but also N-aryl rhodanines can be directly prepared via the reaction of thioureas and thioglycolic
acid in one step catalyzed by protic acid, which provides a new approach of the synthesis
of rhodanine and its derivatives. The developed strategy is straightforward, efficient,
atom economical, and convenient in good yields.
Key words
rhodanine - thiourea - thioglycolic acid - thiazolidone - heterocycle