An efficient strategy for the preparation of spirocyclic indole-N-oxide compounds through a Rh(III)-catalyzed [4 + 1] spiroannulation reaction of N-aryl nitrones with 2-diazo-1,3-indandiones as C1 synthons under extremely mild conditions is presented. From this reaction, 40 spirocyclic indole-N-oxides were easily obtained in up to 98% yield. In addition, the title compounds could be successfully used
一种通过 Rh(III) 催化的 N-芳基硝酮与 2-重氮-
1,3-茚满二酮作为 C1 合成子的 [4 + 1] 螺环化反应制备螺环
吲哚-N-氧化物的有效策略条件提出。从该反应中,可以轻松获得 40 个螺环
吲哚-N-氧化物,收率高达 98%。此外,通过与马来
酰亚胺的非对映选择性 1,3-偶极环加成反应,标题化合物可成功用于构建结构有趣的含马来
酰亚胺的稠合多环支架。