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.
在室温下,将亲核性杂环如吡咯和噻吩及其四氢衍生物与S2Cl2和DABCO在氯仿中反应,可以简单地一步合成融合的单和双五元硫杂环戊烷。N-甲基吡咯及其2-氯和2,5-二氯衍生物以及N-甲基吡咯烷均生成相同的二氯五元硫杂环戊烷1a。N-乙基、异丙基和叔丁基吡咯烷的行为类似;异丙基吡咯烷还生成了双五元硫杂环戊烷6,后者经历了一个有趣的重组变为对称的单五元硫杂环戊烷1c。N-甲基和乙基吲哚根据反应条件分别生成2,3-二氯衍生物8或五元硫杂环戊烷吲哚9。噻吩和四氢噻吩生成五元硫杂环戊烷10。提供了五元硫杂环戊烷1a和1d的X射线晶体结构,并为报道的大量级联反应提出了可能的反应途径。