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.
aza-Prins cyclization - diastereoselective - piperidine - alkaloids - natural products