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Three-component synthesis of stable ketenimines containing a sulfur group based on a capture profile of a zwitterionic intermediate is described. Thus, the reactions of zwitterions, generated from isocyanide and dialkyl acetylenedicarboxylate, react with alkyl mercaptans in CH2Cl2 to afford ketenimines in good yields.
We gratefully acknowledge financial support from the Research Council of Babol University of Technology and Shahid Beheshti University.
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