Silylmethyl-substituted aziridine and azetidine as masked 1, 3-and 1, 4-dipoles for formal [3+ 2] and [4+ 2] cycloaddition reactions

Abstract

2-tert-Butyldiphenylsilylmethyl-substituted aziridine and the corresponding azetidine reacted efficiently with nitriles and carbonyl substrates to generate imidazoline, oxazolidine, and tetrahydropyrimidine products. The azetidine rearranged efficiently to the pyrrolidine skeleton involving migration of silicon under BF₃·Et₂O conditions. The tert-butyldiphenylsilylmethyl function, latent to CH₂OH group, controlled not only the regioselectivity of aziridine and azetidine cleavage but also the relative stereochemistry of the substituents in the products derived from substituted aziridine.