反应详情

A solution of 23 g 1-benzyl-4-hydroxy-4-methylaminomethylpiperidine and 250 ml dichloromethane is mixed with 100 ml of a 15% solution of phosgene in toluene. Evaporation of solvent gives a residue which is treated with 300 ml dichloromethane and 300 ml aqueous sodium bicarbonate. Separation of the dichloromethane layer followed by evaporation gives 20 g 3-methyl-8-benzyl-1-oxa-3,8-diazaspiro[4.5]decan-2-one, mp 137°-138°.

1. customEvaporation of solvent
2. customgives a residue which
3. customSeparation of the dichloromethane layer
4. customfollowed by evaporation