Abstract

α-Nitrosostyrenes ( 2 ), generated in situ, underwent unusual regioselective [3+2]cycloadditions with 1,3-diaza- 1,3-butadienes ( 1 ) leading to cyclic nitrones ( 5 ) in good yields. They also gave cyclic nitrones ( 8 ) with trisubstituted amidines ( 7 ).

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