5-Hydroxy-5-methyl-1-[3-(5-triisopropylsilanyloxy-furan-2-yl)-propyl]-pyrrolidin-2-one 在
lithium perchlorate 作用下,
以
乙醚 为溶剂,
生成 (8S,8aS)-8a-methylspiro[2,5,6,7-tetrahydro-1H-indolizine-8,5'-furan]-2',3-dione 、 (8R,8aS)-8a-methylspiro[2,5,6,7-tetrahydro-1H-indolizine-8,5'-furan]-2',3-dione