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Abstract
The alkyne aza-Prins cyclization of 3,5-diynyl amides and various aldehydes was developed using TfOH with/without (Me2AlO)2SO2. This method, which could be applied to homopropargyl amides, provides TfO-substituted pyrrolidines with E-selectivities and exclusive regioselectivities. This work represents a first example of the aza-Prins cyclization with the introduction of TfO groups.
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