Carbonic acid 1-(4-methoxy-phenyl)-2-trimethylsilanylmethyl-allyl ester methyl ester 、 (2S,3R)-6-[1-Furan-2-yl-meth-(E)-ylidene]-3,4-dimethyl-2-phenyl-[1,4]oxazepane-5,7-dione 在
palladium diacetate 、
三异丙基亚磷酸酯 作用下,
以70%的产率得到(1S,5S,8S,9R)-1-Furan-2-yl-2-(4-methoxy-phenyl)-9,10-dimethyl-3-methylene-8-phenyl-7-oxa-10-aza-spiro[4.6]undecane-6,11-dione