N-Carbamimidoyl-2,2,2-Trifluoro-N′-Arylacetimidamides as Important Intermediates for the Synthesis of 3-Amino-4-Aryl-5-(Trifluoromethyl)-1H-1,2,4-Triazoles

A novel series of N-carbamimidoyl-2,2,2-trifluoro-N′-arylacetimidamides (3a–j) have been prepared via condensation of 2,2,2-trifuoroacetimidoyl chlorides with guanidine in the presence Na and in dry EtOH solvent at ambient temperature. Then, these key intermediates were applied for the synthesized of 3-amino-4-aryl-5-(trifluoromethyl)-1H-1,2,4-triazoles (4a–j) under oxidative cyclization reaction in the presence of KI/I₂ as an oxidant system and DMSO solvent. The target compounds were produced in high yields and without the need for isolation.