A Comparison of the Photosensitized Rearrangement and the Lewis-Acid-Catalyzed Rearrangement of Spirooxindole Epoxides
作者:Lihong Wang、Yibing Su、Xinmin Xu、Wei Zhang
DOI:10.1002/ejoc.201201020
日期:2012.10.5
Spirooxindole epoxides undergo smooth rearrangement either under photosensitization conditions or under Lewis acid catalysis to give different products. The photosensitized rearrangement of spirooxindole epoxides leads to 3-acyl-2-indolones, such as spiro[cycloalkane-1,3′-indolin]-2,2′-diones, by cleavage of the Cα–O bond followed by alkyl migration. The SnCl4-catalyzed rearrangement of spirooxindole
螺环吲哚环氧化物在光敏条件下或在路易斯酸催化下进行平滑重排,得到不同的产物。螺环吲哚环氧化物的光敏重排导致 3-酰基-2-吲哚酮,例如螺[环烷烃-1,3'-吲哚]-2,2'-二酮,通过裂解 Cα-O 键,然后进行烷基迁移。SnCl4 催化的螺环吲哚环氧化物重排得到 4,4-二烷基喹啉-2,3-二酮,例如螺[环烷烃-1,4'-喹啉]-2',3'-二酮,通过裂解 Cβ-O键,然后是芳基迁移。