The thermal [3+2] cycloaddition reaction of N-acyliminophenanthridinium betaines with various allenoates has
been investigated. The reaction was operationally simple and proceeded smoothly under mild reaction conditions, providing
a variety of aromatic tetracyclic heterocycles in moderate to excellent yields.
Keywords: Cycloaddition, azomethine imine, allenoate, heterocycle, phenanthridine.
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