A novel method for the synthesis of 9-aryl-3a,4-dihydronaphtho[2,3-c]furan-1(3H)-ones has been developed by P4-t-Bu-catalyzed intramolecular cascade reactions of enynes. In the presence of a catalytic amount of phosphazene P4-t-Bu base, a variety of 3-arylallyl 3-arylpropiolates underwent the cascade cyclization reaction smoothly in moderate to excellent yields.
通过 P4-t-Bu 催化的烯炔分子内级联反应,开发了一种合成 9-芳基-3a,4-二氢
萘并[2,3-c]
呋喃-1(3H)-酮的新方法。在一定量的
磷氮 P4-t-Bu 碱催化下,多种 3-芳基烯丙基 3-arylpropiolates 顺利地进行了级联环化反应,产率从中等到极好。