重氮甲烷 、
(Z,2R,6R)-5-Benzyliden-2-tert-butyl-6-methyl-1,3-dioxan-4-on 以
乙醚 为溶剂,
生成 (4S,5S,8R,10R)-8-tert-Butyl-10-methyl-4-phenyl-7,9-dioxa-1,2-diaza-spiro[4.5]dec-1-en-6-one 、 (4R,5R,8R,10R)-8-tert-Butyl-10-methyl-4-phenyl-7,9-dioxa-1,2-diaza-spiro[4.5]dec-1-en-6-one