作者:Shunji Ito、Tetsuo Okujima、Shigeru Kikuchi、Taku Shoji、Noboru Morita、Toyonobu Asao、Tadaaki Ikoma、Shozo Tero-Kubota、Jun Kawakami、Akio Tajiri
DOI:10.1021/jo702309b
日期:2008.3.1
thioketone (2a) and their derivatives (1b and 2b−d) with alkyl substituents on each azulene ring, were prepared and their intramolecular pericyclization reaction was examined. The thioketones with a 3-alkyl substituent on each azulene ring exhibited the presumed pericyclization reaction under thermal and acid-catalyzed conditions, although the cases of the 1-azulenyl thioketones without the 3-alkyl substituents
制备了几个氮杂环取代的硫酮,1-硫代苯甲酰基氮(1a)和二(1-氮烯基)硫酮(2a)及其衍生物(1b和2b - d),每个环均具有烷基取代基,并检查了它们的分子内周环化反应。尽管在没有类似条件的情况下,没有氮杂烷基的1-氮杂烯基硫酮的情况下,在复杂的条件下仍能提供复杂的混合物,但在每个氮杂环上具有3-烷基取代基的硫酮在热和酸催化条件下均表现出推测的环化反应。分子内氢转移后的分子内反应得到产物13b,14b和14c。产物13b和14b被转化为相应的阳离子18 +和19 +,其与菲烯基阳离子具有相似的结构。这些阳离子在CV上表现出预期的两步还原波,尽管ESR分析表明中性自由基状态不具有假定的高稳定性。