amine-catalyzed asymmetric γ-regioselective (4 + 3) annulation reaction of isatin-derived Morita–Baylis–Hillman carbonates and 1-azadienes was developed, delivering chiral azepane spirooxindoles with excellent stereoselectivity. In addition, by tuning the substituents of Morita–Baylis–Hillman carbonates, the switchable γ-(4 + 3) or α-(4 + 1) annulation reaction with o-quinone methides was observed to
已开发出手性叔胺催化的异族衍生Morita–Baylis–Hillman碳酸盐和1-氮杂二烯的不对称γ-区域选择性(4 + 3)环化反应,可提供具有出色立体选择性的手性氮杂螺环辛多。此外,通过调节森田-贝利斯-希尔曼碳酸盐的取代基,可观察到与邻醌甲基化物可转换的γ-(4 + 3)或α-(4 +1)环化反应可提供苯并[ b ]氧杂环丁烷或2 ,3-二氢苯并呋喃分别在相似的催化条件下。