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A novel and effective method for the construction of highly functionalized aminothiophenes via the cyclization of gem-difluoroalkenes with β-keto tertiary thioamides is described. The reactions proceed smoothly with the assistance of K2CO3 under transition-metal-free conditions, affording a variety of valuable N,N-disubstituted 2-aminothiophenes in moderate to good yields.

Graphical abstract: Synthesis of N,N-disubstituted 2-aminothiophenes by the cyclization of gem-difluoroalkenes with β-keto thioamides

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