42054-12-6Relevant articles and documents
Synthesis of 3 H-1,2,4-Triazol-3-ones via NiCl2-Promoted Cascade Annulation of Hydrazonoyl Chlorides and Sodium Cyanate
Du, Shiying,Yang, Zuguang,Tang, Jianhua,Chen, Zhengkai,Wu, Xiao-Feng
supporting information, p. 2359 - 2363 (2021/04/05)
A nickel-promoted cascade annulation reaction for the facile synthesis of 3H-1,2,4-triazol-3-ones from readily available hydrazonoyl chlorides and sodium cyanate has been developed. The transformation occurs through a cascade nickel-promoted intermolecular nucleophilic addition-elimination process, intramolecular nucleophilic addition, and a hydrogen-transfer sequence. The method has been successfully applied for the construction of the core skeleton of the angiotensin II antagonist.
PREPARATION OF HYDRAZIDES USING SILICON TETRACHLORIDE AS COUPLING AGENT
Kornet, Milton J.,Tita, Terence T.,Thio, Alan P.
, p. 1261 - 1274 (2007/10/02)
Silicon tetrachloride proved to be an effective reagent for the preparation of hydrazides from carboxylic acids.Yields were comparable to those obtained via N,N'-dicyclohexylcarbodiimide (DCC) and the procedure was used to synthesize some hydrazides which are difficult to obtain otherwise.