Synthesis of cyclic oligomers of pivalolactone has been performed by a cyclooligomerization strategy promoted by a simple catalytic system: potassium alkoxides. The thermodynamic control of macrocyclic oligomerization and yields of macrolides of pivalolactone depend on the reaction conditions, specifically temperature and concentration. In dilute solution, the yield of macrocyclic oligomers is around 75%, in which the trimer and tetramer are the major products. The 16-membered tetrolide has been isolated in crystalline form and its structure has been proven by X-ray crystal structure analysis. The mechanism of the cyclooigomerization is discussed. The strategy of cyclooligomerization with an anionic catalyst offers a unique, simple synthesis of pivalolactone cyclic oligomers, which are potential ligands for metal complexation.