Key points are not available for this paper at this time.
Complex piperidinyl heterocycles (for example, 2) were accessed by using a novel intramolecular formal 3+3 cycloaddition reaction of vinylogous amides tethered with enals (for example, 1). This method has been applied to a formal total synthesis of (+)-gephyrotoxin (3).
Wei et al. (2001) studied this question.