T. Uyehara et al., LEWIS ACID-PROMOTED [2-AZETIDINE ANNULATION OF N-ACYLALDIMINES WITH ALLYLTRIISOPROPYLSILANE(2]), Chemistry Letters, (9), 1995, pp. 789-790
Lewis acid-catalyzed reactions of an N-acylaldimine with allyltriisopr
opylsilane gave [2+2] azetidine annulation products, while those of an
N-ethoxycarbonylaldimine gave an allylated product.