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.
作者:Stanislav A. Amelichev、Lidia S. Konstantinova、Natalia V. Obruchnikova、Oleg A. Rakitin、Charles W. Rees
DOI:10.1021/ol0617042
日期:2006.9.1
Fused aromatic and heterocyclic 1,2,3,4,5-pentathiepins react with triphenylphosphine and alkynes bearing electron-withdrawing groups to give the corresponding 1,4-dithiins in high yields. Unsymmetrical alkynes add regioselectively to afford products in agreement with the electron distribution in a proposed reaction intermediate. A mechanism for these reactions is proposed.
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.