Isoxazolidines with a cyclobutane link

N-(Phenacylidene)- and N-(arylaminooxoethylidene)aniline N-oxides form 11 adducts with methylenecyclobutane. The addition of the nitrones proceeds specifically and leads to substituted isoxazolidines in high yields. In the case of N-(phenylaminooxoethylidene)aniline N-oxide it was shown that 1-methylcyclobutene and bicyclobutylidene also undergo cycloaddition to give isoxazolidines.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1316–1318, October, 1982.