Tetracyclic products featuring predominantly a trans-hexahydroindane unit annelated onto the C(2)/C(3) positions of indole can be accessed by intramolecular cyclocondensation of tethered alkenyl sulfides with either indolidene or indolidenium cation intermediates. Studies with geometrically pure E- and Z-alkenyl sulfide isomers reveal a likely dichotomy of reaction paths that provide mixtures of both
四环产物的主要特征是将反式-
六氢茚满单元退火到
吲哚的C(2)/ C(3)位置,可以通过链烯基
硫醚与
吲哚或
吲哚阳离子中间体的分子内环缩反应来获得四环
茚满单元。用几何上纯的E-和Z-烯基
硫化物异构体进行的研究表明,反应路径可能存在二分法,该反应途径提供了
六氢茚满加合物的区域异构体和立体异构体的混合物。