An attractive approach for the preparation of spirocyclic benzofuran–furocoumarins has been developed through iodine-catalyzed cascade annulation of 4-hydroxycoumarins with aurones. The reaction involves Michael addition, iodination, and intramolecular nucleophilic substitution in a one-step process, and offers an efficient method for easy access to a series of valuable spirocyclic benzofuran–furocoumarins
                                    通过
碘催化 
4-羟基
香豆素与橙酮的级联环化,开发了一种制备螺环
苯并呋喃-
呋喃香豆素的有吸引力的方法。该反应在一步过程中涉及迈克尔加成、
碘化和分子内亲核取代,并提供了一种有效的方法,可以轻松获得一系列有价值的螺环
苯并呋喃-
呋喃香豆素,收率高(高达 99%),具有出色的立体选择性。此外,这种前所未有的方案具有多种优势,包括易于获得的材料、环境友好的催化剂、广泛的底物范围和简单的程序。