Abstract
The Lewis acid mediated intramolecular reaction of gamma-aminoallyl-stannane 6 gave trans-beta-hydroxypiperidine derivative 7a as a major product. On the other hand, the thermal cyclization of 6 and 8 afforded cis-beta-hydroxypiperidine 7b and pyrrolidine derivative 9b, respectively, with very high stereoselectivity.
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