methyl N-(4-chlorobenzylidene)glycinate 、
deoxyartemisitene 在
(S)-1-[(R)-2-(diphenylphosphino)ferrocenyl]ethylamine 、
silver(I) acetate 、
三乙胺 作用下,
以
四氢呋喃 为溶剂,
以70%的产率得到methyl (2R,3S,3a'S,3a1'R,5R,6'R,6a'S,9'S,10a'S)-2-(4-chlorophenyl)-6',9'-dimethyl-2'-oxooctahydro-2'H,10a'H-spiro[pyrrolidine-3,3'-[3a1,9]epoxyoxepino[4,3,2-iJ]isochromene]-5-carboxylate