50483-72-2Relevant academic research and scientific papers
One-pot synthesis of 3,5-disubstituted 1,2,4-thiadiazoles from nitriles and thioamides: Via I2-mediated oxidative formation of an N-S bond
Chai, Ling,Xu, Yuanqing,Ding, Tao,Fang, Xiaomin,Zhang, Wenkai,Wang, Yanpeng,Lu, Minghua,Xu, Hao,Yang, Xiaobo
, p. 8410 - 8417 (2017)
A simple and practical method for I2-mediated one-pot synthesis of 3-alkyl-5-aryl-1,2,4-thiadiazoles has been developed; the one-pot reaction includes sequential intermolecular addition of thioamides to nitriles, and intramolecular oxidative coupling of N-H and S-H bonds mediated by molecular iodine. Meanwhile the protocol uses readily available nitriles and thioamides as the starting materials, molecular iodine as the oxidant, and generates various 1,2,4-thiadiazoles in moderate to good yields with a wide array of functional groups. This method is an efficient approach for the synthesis of unsymmetrically disubstituted 1,2,4-thiadiazoles.
An alternatively metal-free synthesis of 1,3,5-triazines or 1,2,4-thiadiazoles from benzyl chlorides and benzylamines mediated by elemental sulfur
Zhang, Yurong,Liu, Yafei,Zhang, Jun,Gu, Ren,Han, Shiqing
supporting information, (2019/11/11)
An elemental sulfur mediated reaction of benzyl chlorides with benzylamines is developed, which allows the practical synthesis of valuable 1,3,5-triazines. This protocol that is metal free, ligand free, and uses inexpensive elemental sulfur as oxidant or raw material displays mild reaction conditions, a broad substrate scope and moderate to good yields. Moreover, the modified sulfur-mediated reaction system can also be used to synthesize 1,2,4-thiadiazoles, by simply switching the stoichiometry of sulfur powder from 0.75 equivalents to 5 equivalents.
Nitrile Sulphides. Part 3. Thermal Fragmentation of 1,3,4-Oxathiazoles: Formation of Nitrile Sulphides in a Retro-1,3-dipolar Cycloaddition Reaction
Paton, R. Michael,Robertson, Fiona M.,Ross, John F.,Crosby, John
, p. 1517 - 1522 (2007/10/02)
On thermolysis at ca. 160 gradC 1,3,4-oxathiazoles undergo retro-1,3-dipolar cycloaddition forming nitrile sulphides and carbonyl-containing fragments.The nitrile sulphides either decompose to sulphur and nitriles or are trapped as their 1,3-dipolar cycloadducts in the presence of dipolarophiles (dimethyl acetylenedicarboxylate, ethyl cyanoformate, benzonitrile, ethyl propiolate).Similar ratios (1.32, l.34, 1.33, 1.31) of 4- and 5-ethoxycarbonyl-3-(p-methoxyphenyl)isothiazole obtained from four sources of p-methoxybenzonitrile sulphide with ethyl propriolate provide strong evidence for product formation from a discrete intermediate nitrile sulphide rather than via direct interaction of precursor with dipolarophile. 2-Dichloromethylene-1,3,4-oxathiazoles, prepared by dehydrochlorination of 2-trichloromethyloxathiazoles, prepared by dehydrochlorination of 2-trichlorometyloxathiazoles, likewise fragment to nitrile sulphides, but attempts to trap dichloroketene were unsuccessful.
REACTION OF SULFUR DICHLORIDE WITH NITRILE IN THE PRESENCE OF LEWIS ACID FORMING 1,2,4-THIADIAZOLE.
Komatsu,Shibata,Ohshiro,Agawa
, p. 180 - 183 (2007/10/02)
Formation of 3,5-disubstituted 1,2,4-thiadiazoles by the reaction of sulfur dichloride with nitriles in the presence of a Lewis acid was found. For example, 3,5-diphenyl-1,2,4-thiadiazole was obtained with its chlorinated products, 3-o-chlorophenyl-5-phen
