3-Methylidene-5-phenylhydantoin and 3-methylidene-5-phenylthiohydantoin react with cyclopentadiene forming spirocyclic Diels–Alder adducts. In contrast, their reactions with furan in the presence of AlCl3 give the products of the furan α-amidoalkylation.
3-亚甲基-5-苯基乙内酰
脲和3-亚甲基-5-苯基
硫乙内酰
脲与
环戊二烯反应形成螺环Diels-Alder加合物。相反,它们在AlCl 3存在下与
呋喃的反应得到
呋喃α-酰胺基烷基化的产物。