The regioselectivity of intramolecular nucleophilic ring opening reaction of aziridines is controlled by the ring size of products, fivemembered ring> six-membered ring> seven-membered ring.

• 分子内的亲核开环反应主要受成环时环大小的控制，成环时的倾向是五元环＞六元环＞七元环。