A novel and efficient method has been developed for the direct construction of imino-pyrrolidine-thione scaffold via the coupling of isocyanides, heterocyclic thiols, and gem-dicyano olefins. Smiles rearrangement followed by intramolecular cyclization leads directly to formation of the core structure. A water-acceleration effect is observed, promoting most of the reactions to go to completion within a short reaction time.
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Zhu et al. (2010) studied this question.
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