Synthesis of 1,2,4-Triazolines: Base-Catalyzed Hydrazination/Cyclization Cascade of α-Isocyano Esters and Amides
作者:David Monge、Kim L. Jensen、Irene Marín、Karl Anker Jørgensen
DOI:10.1021/ol102812c
日期:2011.1.21
A convenient, efficient synthesis of 1,2,4-triazolines from α-isocyano esters/amides and azodicarboxylates is presented. The developed reaction cascade is based on a base-catalyzed hydrazination-type reaction followed by a subsequent cyclization providing the triazolines in good to excellent yields (75−99%). Phosphine-catalyzed and preliminary asymmetric phase-transfer catalysis approaches have also