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N,N-Dialkylhydrazides of S-(4,6,7-trichloro-2,5-dihydroxy-2,3-dihydrobenzo[b]-3-furanyl)dithiocarbonic acids have been obtained by the reaction of 3,4,6,7-tetrachloro-2,5-dihydroxy-2,3-dihydrobenzo[b]furan with N,N-dialkylhydrazinium salts of N,N-dialkylhydrazides of dithiocarbonic acids. Recyclization in boiling ethanol in the presence of conc. HCl with subsequent oxidation leads to the formation of 3-N,N-dialkylamino-5-(3,5,6-trichloro-1,4-benzoquinon-2-yl)thiazoline-2-thiones. An attempt at recyclization in boiling trifluoroacetic acid led to the formation of 3-N,N-dialkylamino-5,6,8-trichloro-7-hydroxy-2,3,3a,8b-tetrahydrothiazolo[4,5-b]benzo[d]furane-2-thiones. 相似文献
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4,6,7-Trichloro-2-hetarylamino-5-hydroxy-2,3-dihydrobenzo[b]furans have been prepared from 4,6,7-trichloro-2,5-dihydroxy-2,3-dihydrobenzo[b]furan and hetarylamines. Reductive opening of the dihydrobenzofuran ring in these compounds gave 3,5,6-trichloro-2-(-hetarylaminoethyl)hydroquinones. The latter could be oxidised to the target 3,5,6-trichloro-2-(-hetarylaminoethyl)-1,4-benzoquinones which are novel 1,4-benzoquinone derivatives with intramolecular charge transfer. 相似文献
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Vladimir V. Chernyshev Sanita Petkune Andris Actins Raimonds Auzins Dmitry I. Davlyatshin Pavel V. Nosyrev Yurii A. Velikodny 《Acta Crystallographica. Section C, Structural Chemistry》2013,69(3):299-302
Afobazole {systematic name: 2‐[2‐(morpholin‐4‐yl)ethylsulfanyl]‐1H‐benzimidazole} is a new anxiolytic drug and Actins, Auzins & Petkune [(2012). Eur. Patent EP10163962] described four polymorphic modifications. In the present study, the crystal structures of two monoclinic polymorphs, 5‐ethoxy‐2‐[2‐(morpholin‐4‐ium‐4‐yl)ethylsulfanyl]‐1H‐benzimidazol‐3‐ium dichloride, C15H23N3O2S2+·2Cl−, (II) and (IV), have been established from laboratory powder diffraction data. The crystal packing and conformation of the dications in (II) and (IV) are different. In (II), there are channels in the [001] direction, which offer atmospheric water molecules an easy way of penetrating into the crystal structure, thus explaining the higher hygroscopicity of (II) compared with (IV). 相似文献
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Aminovinyl derivatives of quinoline-5,8-dione and isoquinoline-5,8-dione were obtained. The structure of (E)-6-chloro-7-[2-(N,N-diethylamino)vinyl]quinoline-5,8-dione was confirmed by X-ray structural analysis. 相似文献
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When 4,6,7-trichloro-5-hydroxy-2-(2-pyrimidylamino)- 2,3-dihydrobenzo[b]furan reacted with phenyliodoso diacetate, an unexpected oxidative recyclization was observed to give 3-(3,5,6-trichloro-1,4-benzoquinon-2-yl)imidazo[1,2-a]pyrimidine. 2-[N-2-(3,5,6-Trichloro-1,4-benzoquinon-2-yl)ethenylamino]pyrimidine is the intermediate product in the conversion. 相似文献
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Ya. Stradyn' R. Gavars L. Baumane R. Valters 《Chemistry of Heterocyclic Compounds》1995,31(2):227-230
The ESR method was used to confirm the formation of free anion radicals in the source of electrochemical reduction of 5-thiazolul-substituted 1,4-benzoquinones and related compounds, as well as the ability of the unpaired electron to become delocalized over the system of electrons not only of the benzoquinone nucleus but also of the hetaryl substituent added to it.Latvian Institute of Organic Synthesis, Riga, LV-1006. Riga Technical University, Riga, LV-1048. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 258–261, February, 1995. Original article submitted December 30, 1994. 相似文献