Diiiodine/Potassium Persulfate Mediated Synthesis of 1,2,3-Thiadiazoles from N-Tosylhydrazones and a Thiocyanate Salt as a Sulfur Source under Transition-Metal-Free Conditions
作者:Yadong Sun、Ablimit Abdukader、Yuhan Lu、Chenjiang Liu
DOI:10.1055/a-1473-7369
日期:2021.6
efficient method for the synthesis of 1,2,3-thiadiazoles has been developed by utilizing readily available tosylhydrazones and ammonium thiocyanate with ecofriendly EtOH as the solvent at room temperature. The reaction shows a wide scope of substrates and good functional-group tolerance. This protocol can be scaled up to a gram level and can be applied to coupling reactions with 4-(4-bromophenyl)-1
Iodine-catalyzed the reaction of substituted methyl ketone N-tosylhydrazones with elemental sulfur has been developed. The cyclizations of the ester-substituted N-tosylhydrazone substrates proceeded smoothly under optimal reaction conditions, and the corresponding products 4-alkyl-1, 2, 3-thiadiazoles are obtained. For the reaction of 4-arylbutan-2-one of N-tosylhydrazone substrates, (E)-4-styryl-1
Shafiee, A.; Vosooghi, M.; Lalezari, I., Journal of Heterocyclic Chemistry, 1980, vol. 17, p. 545 - 547
作者:Shafiee, A.、Vosooghi, M.、Lalezari, I.
DOI:——
日期:——
TBAI-Catalyzed Reaction between <i>N</i>-Tosylhydrazones and Sulfur: A Procedure toward 1,2,3-Thiadiazole
作者:Jiangfei Chen、Yan Jiang、Jin-Tao Yu、Jiang Cheng
DOI:10.1021/acs.joc.5b02280
日期:2016.1.4
A TBAI-catalyzed reaction between N-tosyl hydrazone and sulfur was developed, leading to 1,2,3-thiadiazoles in moderate to good yields. It represents a facile and practical procedure to access thiadiazole under metal-free conditions. This procedure serves as an improvement for the Hurd-Mori reaction.