Synthesis of 1,2,4-dioxazolidines by the ozonolysis of vinyl ethers in the presence of imines. The first [3 + 2] cycloaddition of carbonyl oxide to the carbon–nitrogen double bond

Carbonyl oxides, derived from the ozonolysis of vinyl ethers, readily undergo [3 + 2] cycloaddition reactions with imines affording 1,2,4-dioxazolidines in good yield.