5-Hydroxy-1-[4-(5-triisopropylsilanyloxy-furan-2-yl)-butyl]-pyrrolidin-2-one 在
lithium perchlorate 作用下,
以
乙醚 为溶剂,
生成 (±)-(2S,9a'S)-1',5',6',7',8',9a'-hexahydro-5H-spiro[furan-2,9'-pyrrolo[1,2-a]azepine]3',5(2'H)-dione 、 (±)-(2R,9a'S)-1',5',6',7',8',9a'-hexahydro-5H-spiro[furan-2,9'-pyrrolo[1,2-a]azepine]3',5(2'H)-dione