DABCO-catalyzed [3+2] cycloaddition reactions of azomethine imines with N -aryl maleimides: facile access to dinitrogen-fused heterocycles

DABCO-catalyzed [3+2] cycloaddition of azomethine imines with maleimides has been developed. This method could efficiently furnish dinitrogen-fused tetracyclic heterocycles in high levels of regioselectivity and with good yields.