A Concise and Diastereoselective Synthesis of Piperidine and Indolizidine Alkaloids via Aza-Prins Cyclization

Abstract

The synthesis of 2-substituted and 2,4-disubstituted piperidine alkaloids such as (±)-coniine, (±)-hydroxypipecolic acid, (±)-pipecolic acid, (±)-coniceine, and (±)-4-hydroxy-2-hydroxy­methyl piperidine have been accomplished in a highly diastereo­selective manner by employing aza-Prins cyclization as a key step to construct the piperidine core of these alkaloids.