[3+3] Cycloadditions of Azomethine Ylides with Nitrile Imines for the Synthesis of 2,3,4,5‐Tetrahydro‐1,2,4‐Triazine‐5‐Carboxylates

Abstract 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.