FeCl3-catalyzed cyclization of alpha-sulfonamido-allenes with aldehydes-the substituent effect

[摘要]：FeCl3-catalyzed aza-Prins-cyclization reaction of alpha-sulfonamido-allenes with aldehydes afforded 1,2,3,6-tetrahydropyridine or 2,5-dihydro-1H-pyrrole derivatives efficiently and highly selectively. The different regioselectivity is probably caused by the stabilizing effect of the phenyl group on the positively charged allylic intermediate.

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