The conversion of 2-(4-chloro-5H-1,2,3-dithiazolylideneamino)benzonitriles into 3-aminoindole-2-carbonitriles using triphenylphosphine
作者:Sophia S. Michaelidou、Panayiotis A. Koutentis
DOI:10.1016/j.tet.2009.07.064
日期:2009.10
2-(4-Chloro-5H-1,2,3-dithiazolylideneamino)benzonitrile 1a reacts with triphenylphosphine (4 equiv) in the presence of water (2 equiv) to afford anthranilonitrile 2a, 3-aminoindole-2-carbonitrile 3a and (2-cyanoindol-3-yl)iminotriphenylphosphorane 4a, together with triphenylphosphine sulfide and oxide. The use of polymer bound triphenylphosphine provides cleaner reaction mixtures. 2-(4-Chloro-5H-1
2-(4-氯-5 H -1,2,3-二噻唑基亚氨基氨基)苄腈1a在水(2当量)存在下与三苯基膦(4当量)反应生成蒽腈2a,3-氨基吲哚-2-腈3a和(2-氰基吲哚-3-基)亚氨基三苯基膦4a以及三苯基膦硫化物和氧化物。聚合物键合的三苯膦的使用提供了更清洁的反应混合物。2-(4-氯-5 H -1,2,3-二噻唑基亚氨基)-4,5-二甲氧基苄腈1h经三苯膦处理后不生成相应的吲哚,但生成6,7-二甲氧基喹唑啉-2-腈5(15% )和2-氰基-4,5-二甲氧基氰基硫代甲酰苯胺6(36%)。总共准备并完全表征了七个新的3-氨基吲哚-2-腈3a – g。
Reactions of 4-chloro-5H-1,2,3-dithiazol-5-thione with primary and secondary alkylamines: Novel method for preparing N-alkyl- and N,N-dialkylcyanothioformamides
作者:Hyi-Seung Lee、Kyongtae Kim
DOI:10.1016/0040-4039(96)00647-8
日期:1996.5
Treatment of 4-chloro-5H-1,2,3-dithiazol-5-thione with primary and secondaryalkylamines in CH2Cl2 at room temperature afforded N-alkyl- and N,N-dialkylcyanothioformamides, respectively.
The Synthesis of 2-Cyano-cyanothioformanilides from 2-(4-Chloro-5H-1,2,3-dithiazol-5-ylideneamino)benzonitriles Using DBU
作者:Panayiotis Koutentis、Sophia Michaelidou
DOI:10.1055/s-0029-1217059
日期:——
A series of 2-(4-chloro-5H-1,2,3-dithiazol-5-ylideneamino)benzonitriles were prepared from the reaction of 4,5-dichloro-1,2,3-dithiazolium chloride (Appel salt) and the corresponding anthranilonitriles. Reaction of the 1,2,3-dithiazolimines with DBU (3 equiv) at -5 ËC gave the corresponding 2-cyano-cyanothioformanilides in near quantitative yields. Treatment of 2-(4-chloro-5H-1,2,3-dithiazol-5-ylideneamino)benzonitrile with DBU (4 equiv) at -5 to +20 ËC gave 2-isothiocyanatobenzonitrile in 96% yield. The latter compound was also formed directly from 2-cyano-cyanothioformanilide on treatment with DBU (1 equiv) in 95% yield. A tentative mechanism for the DBU-mediated dithiazole to cyanothioformanilide transformation is proposed and all compounds were fully characterized.
Reactions of 4-chloro-5<i>h</i>-1,2,3-dithiazole-5-thione with α,β-unsaturated β-amino esters: Formation of 2-[2-(1-alkenylsulfanyl-1-alkoxycarbonyl-2-amino)-1,2-dicyano-vinylsulfanyl]-3-amino-2-alkenoic alkyl esters
作者:Yong-Goo Chang、Kyongtae Kim、Yung Ja Park
DOI:10.1002/jhet.5570390103
日期:2002.1
Treatment of 4-chloro-5H-1,2,3-dithiazole-5-thione with alkyl 3-alkyl (or aryl)-3-amino-2-propenoates in the presence of pyridine (2 equivalents) in dichloromethane at reflux gave 2-[2-(1-alkenylsulfanyl-1-alkoxy-carbonyl-2-amino)-1,2-dicyanovinylsulfanyl]-4 and-1,2-dicyanovinyldisulfanyl]-3-amino-2-alkenoicalkylesters 7 in 16 to 60% and 8 to 48% yields, respectively.
在吡啶(2当量)在二氯甲烷中回流下,用3-烷基(或芳基)-3-氨基-2-丙烯酸烷基酯处理4-氯-5 H -1,2,3-二噻唑-5-硫酮得到2- [2-(1- alkenylsulfanyl-1-烷氧基羰基-2-氨基)-1,2- dicyanovinylsulfanyl] - 4和-1,2- dicyanovinyldisulfanyl] -3-氨基-2-链烯酸烷基酯7在产率分别为16%至60%和8%至48%。
1,2,4-Thiadiazole 4-oxides
作者:Lidia S. Konstantinova、Oleg A. Rakitin、Charles W. Rees、Tomás Torroba、Andrew J. P. White、David J. Williams
DOI:10.1039/a904386a
日期:——
better yield, the best being from the N-methylcarbamate 8e (30%). The derivative 10 of other benzamidoximes, with electron releasing substituents gives the analogous 5-cyano-3-aryl-1,2,4-thiadiazole 4-oxides 11 in comparable yield. The N-oxides are shown to be the 4-isomers by analysis of the NMR and mass spectra of 15N-labelled and unlabelled products and X-ray structure determination of the derived