1-(morpholin-4-yl)cyclooctene 、
5,5-dimethyl-cyclohexane-1,2,3-trione 以
二氯甲烷 为溶剂,
以61%的产率得到4'a,5',6',7',8',9',10',10'a-Octahydro-4,4,4'',4''-tetramethyl-10'a-morpholinodispiro[cyclohexan-1,2'-[1,3]cyclooctadioxin-4',1''-cyclohexan]-2,2'',6,6''-tetron