In this paper we report that a hydrazinopeptide synthesized using soli
d-phase N-electrophilic amination with N-Boc-3-(4-cyanophenyl)oxazirid
ine reacted with a lipophilic peptide aldehyde to give the correspondi
ng hydrazone plus an unexpected 1,3,4-oxadiazolidinopeptide containing
two peptide aldehyde units. This methodology allows the synthesis of
large lipopeptides.