The solid-phase synthesis of 1,7-disubstituted-1,3,5-triazepane-2,4-diones
from resin-bound amino acids is described. The exhaustive reduction of soli
d-support bound amides with borane afforded the requisite secondary amines,
which following treatment with phenyl isocyanatoformate and cleavage, prov
ided the corresponding triazepane-2,4-diones.