反应详情

A solution of 7-benzyl-2-methyl-2,7-diazaspiro [4.4]nonane dihydrochloride in 150 ml of methanol with 1.0 g 20% palladium on carbon catalyst was hydrogenated at 4.5×105 Pa for two days. After filtration, the filtrate was concentrated to a thick syrup which crystallized on addition of acetonitrile to give 11.5 g of 2-methyl-2,7-diazaspiro[4.4]nonane dihydrochloride, softened at 164° C. and melted at 168°-170° C.

1. filtrationAfter filtration
2. concentrationthe filtrate was concentrated to a thick syrup which
3. customcrystallized on addition of acetonitrile