A straightforward procedure for the synthesis of enantiopure polysubstituted piperidines is reported. It involves the direct generation of chiral non-racemic oxazolo[3,2-a]piperidone lactams that already incorporate carbon substituents on the heterocyclic ring and the subsequent removal of the chiralauxiliary. The key step is a cyclocondensation reaction of (R)-phenylglycinol or other amino alcohols
The first synthesis of the marine indolizidine alkaloids, (+)-stellettamide A and (-)-stellettamide C, has been achieved through a coupling reaction with the aminomethylindolizidine fragment and the chiral or achiral trienecarboxylic acid fragment, both of which could be derived from farnesol as a common precursor.