The synthesis of (-)-depentylperhydrohistrionicotoxin 2 from the 2-cyano-6-oxazolopiperidine synthon (-) 3 has been achieved. The spiro skeleton was formed by an aldol cyclization of a methyl ketone and an aldehyde function belonging to chains borne at C-2. Since the transformation of (±)-2 into (±)perhydrohistrionicotoxin 1 is known, the synthesis of (-)-2 represents a formal synthesis of (-)-per