(5S,8S)-1-{[2,6-bis-(pyridin-2-yl)pyridin-4-yl]methyl}-2,4-dioxo-3-phenyl-1,3,7-triazaspiro[4.4]nonane-8-carboxylic acid 在
N,N-二异丙基乙胺 、
Methanaminium,N-[(dimethylamino)(3H-1,2,3-triazolo[4,5-b]pyridin-3-yloxy)methylene]-N-methyl-, hexafluorophosphate(1-) 作用下,
以
二氯甲烷 、
N,N-二甲基甲酰胺 为溶剂,
以31%的产率得到(3′S,4S,9′S,11′S)-3,3″-bis({[2,6-bis(pyridin-2-yl)pyridin-4-yl]methyl})-1,1″-diphenyldispiro[imidazolidine-4,5′-[1,7]diazatricyclo[7.3.0.03,7]-dodecane-11′,4″-imidazolidine]-2,2′,2″,5,5″,8′-hexone