benzothiophene are the important class of bioactive compounds found abundant in nature. The Diels–Alder reactions of 2-(1′-cycloalkenyl)thiophenes and 2-(1′-cycloalkenyl)benzo[b]thiophenes having the alkene groups present in five-, six-, seven-, eight-, and twelve-membered rings with substituted N-phenylmaleimides are characterized. The size of the cycloalkene rings plays a critical role in dictating the
                                    噻吩和
苯并噻吩的支架是自然界中发现的丰富的
生物活性化合物的重要类别。2-(1'-环烯基)
噻吩和2-(1'-环烯基)苯并[ b ]
噻吩的Diels-Alder反应具有在五个,六个,七个,八个和十二个烷基中存在的烯基N取代的成员环-苯基马来
酰亚胺被表征。环烯环的大小在决定预期的和异构化的Diels-Alder加合物的产物分布中起着至关重要的作用。2D NMR研究表明,具有五,六和七元环的2-(1'-环烯基)
噻吩的分离的异构体是芳构化的
苯并噻吩产物,而八和十二元环是未重排的加合物。另外,对于五元和六元环的情况,分离出随后的与N-苯基马来
酰亚胺的烯反应的产物。有趣的是,在2-(1'-环烯基)苯并[ b具有五元,六元,七元,八元和十二元环的]
噻吩,在任何情况下均未分离未重排的
二苯并噻吩Diels-Alder加合物。进行分子力学和密度泛函理论(M06-2X和PBE0-D3)的计算是为了了解各种二烯对于