The synthesis of an enantiomeric pair of enaminoesters from phenylglyc
ine is described. Conjugate addition to alpha,beta-enones, reductive c
yclization-fragmentation to octahydroimidazopyridines and further redu
ction to remove the auxiliary atoms, completes a new route to homochir
al piperidines in which the enaminoesters function as homochiral 'etha
nal enamines'.