An unprecedented and efficient [3 + 3] cycloaddition of azomethine ylides with nitrile imines has been achieved. A series of 2,3,4,5-tetrahydro-1,2,4-triazine-5-carboxylates were obtained in moderate to excellent yields. Notable features of this reaction include readily accessible reagents, broad substrate scope (34 examples), mild reaction conditions and operational simplicity.
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