反应详情

A solution of 3.0 g of 1-oxa-4,9-diazaspiro[5.5]undecan-3-one and 5 ml of phenylethyl bromide in 60 ml of dimethylformamide and 10 ml of triethylamine was heated at 70° C. for 3 hours. The mixture was poured into water, extracted with methylene chloride and the extract was washed with water and evaporated. Crystallization of the residue from ethyl acetate gave 1.2 g of 9-(2-phenylethyl)-1-oxa-4,9-diazaspiro[5.5]undecan-3-one, m.p. 140°-141° C. The HCl salt of 9-(2-phenethyl)-1-oxa-4,9-diazaspiro[5.5]undecan-3-one was prepared by dissolving the free base in methanolic HCl and precipitating with ether, m.p. 247°-250° C.

1. extractionextracted with methylene chloride
2. washthe extract was washed with water
3. customevaporated
4. customCrystallization of the residue from ethyl acetate