A one-step synthesis of fused pentathiepinsElectronic supplementary information (ESI) available: characterization of compounds 2–5, 9, and 11. See http://www.rsc.org/suppdata/cc/b2/b203349f/
作者:Lidia S. Konstantinova、Oleg A. Rakitin、Charles W. Rees
DOI:10.1039/b203349f
日期:2002.5.17
Treatment of nucleophilic heterocycles like pyrroles and thiophene, and their tetrahydro derivatives, with S2Cl2 and a base in chloroform at room temperature provides a simple one-pot synthesis of heterocyclic fused mono and bis pentathiepins such as 2, 3, 4, 5, 9, and 11.
作者:Stanislav A. Amelichev、Lidia S. Konstantinova、Konstantin A. Lyssenko、Oleg A. Rakitin、Charles W. Rees
DOI:10.1039/b508186f
日期:——
Treatment of nucleophilic heterocycles like pyrroles and thiophenes, and their tetrahydro derivatives, with S2Cl2 and DABCO in chloroform at room temperature provides a simple one-pot synthesis of fused mono and bispentathiepins. N-Methylpyrrole and its 2-chloro and 2,5-dichloro derivatives and N-methylpyrrolidine all give the same dichloropentathiepin 1a. N-Ethyl, isopropyl and tert-butylpyrrolidine behave similarly; the isopropylpyrrolidine also gives the bispentathiepin 6 which undergoes an intriguing rearrangement to the symmetrical monopentathiepin 1c. N-Methyl and ethyl indole give either 2,3-dichloro derivatives 8 or the pentathiepinoindoles 9, depending upon the reaction conditions. Thiophene and tetrahydrothiophene give the pentathiepin 10. X-Ray crystal structures are provided for the pentathiepins 1a and 1d, and possible reaction pathways are suggested for the extensive cascade reactions reported.
Regioselective synthesis of pentathiepino-fused pyrroles and indoles
作者:Lidia S. Konstantinova、Oleg A. Rakitin、Charles W. Rees、Stanislav A. Amelichev
DOI:10.1070/mc2004v014n03abeh001912
日期:2004.1
Treatment of simple pyrroles, pyrrolidines and indoles with S2Cl2 and Dabco in chloroform at room temperature gives their fused pentathiepino derivatives 4, 6 and 8 in extensive cascade reactions; the reaction profile is changed and the regioselectivity enhanced when the S2Cl2 and Dabco are premixed and equilibrated before the heterocycle is added.
Formation of unsymmetrical 1,4-dithiins from fused 1,2,3,4,5-pentathiepins: synthesis, structural, and computational study
作者:Lidia S. Konstantinova、Stanislav A. Amelichev、Pavel A. Belyakov、Dmitry V. Khakimov、Tatyana S. Pivina、Konstantin A. Lyssenko、Oleg A. Rakitin
DOI:10.1016/j.tet.2011.10.113
日期:2012.1
Pentathiepinopyrroles reacted with methyl propiolate and triphenylphosphine to give regioselectively dithiinopyrroles in agreement with the electron distribution in the proposed reaction intermediate. Thieno[2,3-f][1,2,3,4,5]pentathiepin when treated with methyl propiolate and triphenylphosphine gave a pair of regioisomers where the higher yielding regioisomer contained the same mode of junction as in the case of pentathiepinopyrroles. X-ray crystal structures are provided for the thieno[2,3-b][1,4]dithiine carboxylate isomers. Quantum-chemical calculations B3LYP/6-31G(d) and B3LYP/6-311(++)G(d,p) have been carried out for better understanding of the reaction mechanisms; the index of synchronism of the S-h addition and the index of a relative difference in bond orders in transition states are in good agreement with the formation of the regioisomers by the reaction of unsymmetrical pentathiepins with alkynes containing one electron-withdrawing group. (C) 2011 Elsevier Ltd. All rights reserved.
Regioselective synthesis of pentathiepines fused with pyrrole, thiophene, or indole rings
作者:L. S. Konstantinova、S. A. Amelichev、O. A. Rakitin
DOI:10.1007/s11172-006-0551-1
日期:2006.11
Pentathiepines fused with pyrrole, thiophene, or indole rings were obtained by reactions of the corresponding heterocycles or their tetrahydro derivatives with a prepared mixture of sulfur monochloride and DABCO.