4-(2-氯-5-硝基苯基)-1,2,3-噻二唑进行开环反应生成硫代烯酮中间体,该中间体与O-或N-亲核试剂反应,形成芳基取代的硫代乙酸的酯或酰胺酸。通过芳香环中卤素的亲核取代,硫代乙酸衍生物的分子间环化反应会得到N-取代的吲哚-2-硫醇(如果是N-亲核试剂)或2-烷氧基取代的苯并[ b ]噻吩(如果是的亲核试剂)。该反应也适用于N-取代的吲哚-2-硫醇的杂环类似物的合成:1-丁基-1,3-二氢吡咯并[2,3- b以[吡啶] -2-硫酮为例进行了合成。在硫代乙酸钾(S-亲核试剂)的存在下,4-硝基-2-(1,2,3-噻二唑-4-基)苯硫醇的生成速度比噻二唑开环更快,从而使杂环对碱基的耐受性。
Synthesis of 2-aminobenzo[b]thiophenes from 4-(2-haloaryl)-1,2,3-thiadiazoles
作者:D. A. Androsov、E. A. Popova、M. L. Petrov、A. I. Ponyaev
DOI:10.1134/s1070363214120093
日期:2014.12
A new approach to the synthesis of 2-aminobenzo[b]thiophenes was developed on the basis of reaction of 4-aryl-1,2,3-thiadiazoles with amines in the presence of potassium carbonate. The effect of the nature of substituent in the benzene ring of the starting 4-aryl-1,2,3-thiadiazoles on the structure of the final product was studied.
在碳酸钾的存在下,基于4-芳基-1,2,3-噻二唑与胺的反应,开发了一种新的2-氨基苯并[ b ]噻吩合成方法。研究了起始4-芳基-1,2,3-噻二唑苯环中取代基的性质对最终产物结构的影响。
A convenient approach towards 2- and 3-aminobenzo[b]thiophenes
作者:Dmitry A. Androsov、Andrey Y. Solovyev、Mikhail L. Petrov、Ray J. Butcher、Jerry P. Jasinski
DOI:10.1016/j.tet.2010.01.069
日期:2010.3
Reaction of 1-(2-chloro-5-nitrophenyl)ethanone via Willgerodt-Kindler route with primary or secondary amines and Sulfur allows a simple, efficient one-pot synthesis of 3-aminobenzo[b]thiophenes. Base-catalyzed transformation of 4-(2-chloro-5-nitrophenyl)-1,2,3-thiadiazole in the presence of primary and secondary amines offers a convenient approach towards 2-aminobenzo[b]thiophenes. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis of 1,1-Dialkylindolium-2-thiolates via Base-Induced Transformation of 4-(2-Chloro-5-nitrophenyl)-1,2,3-thiadiazole in the Presence of Secondary Amines
作者:Dmitry A. Androsov
DOI:10.1021/jo801801y
日期:2008.11.7
4-(2-Chloro-5-nitrophenyl)-1,2,3-thiadiazole undergoes ring-opening to produce a thioketene intermediate that reacts with secondary amines forming 2-(2-chloro-5-nitrophenyl)-N,N-dialkylthioacetamides. Intramolecular cyclization of these thioamides via nucleophilic substitution of the halogen on the aromatic ring affords nonaromatic 1,1-dialkylindolium-2-thiolates instead of the expected aromatic N,N-dialkylaminobenzo[b]thiophenes.
A convenient synthesis of benzo[b]chalcogenophenes from 4-(2-chloro-5-nitrophenyl)-1,2,3-chalcogenadiazoles
作者:Anna G. Lyapunova、Dmitry A. Androsov、Mikhail L. Petrov
DOI:10.1016/j.tetlet.2013.04.077
日期:2013.6
An unusual base-promoted transformation of readily available 4-(2-chloro-5-nitrophenyI)-1,2,3-thia-and selenadiazoles affords a convenient approach toward benzo[b]thiophenes and benzo[b]selenophenes. (C) 2013 Elsevier Ltd. All rights reserved.
A New Synthesis of Benzo[<i>b</i>]thiophene-2-thiolates and Their Derivatives <i>via</i> Base-Promoted Transformation of 4-(2-Mercaptophenyl)-1,2,3-thiadiazoles
作者:Fedor S. Teplyakov、Tatiana G. Vasileva、Mikhail L. Petrov、Dmitry A. Androsov
DOI:10.1021/ol401981w
日期:2013.8.2
A reaction of 4-(2-mercaptophenyl)-1,2,3-thiadiazoles with an oxidant in the presence of 1.1 equiv of base afforded good yields of benzo[4,5]thieno[3,2-d][1,2,3]thiadiazoles via the intramolecular oxidative nucleophilic substitution of a hydrogen (ONHS) pathway. The reaction of 4-(2-mercaptophenyl)-1,2,3-thiadiazoles in the presence of >= 2 equiv of base gave 2-mercaptobenzo[b]thiophenes via an anionic ring-opening/ring-closure pathway.