反应详情

A mixture of 1-(3,4,5-trimethoxybenzoyl)piperazine (2.0 g), a Lawesson reagent [2,4-bis(4-methoxyphenyl)-1,3-dithia-2,4-diphosphethane-2,4-disulfide] (2.9 g) and benzene (20 ml) is heated for 30 minutes under reflux. 1N HCl (100 ml) and ethyl acetate are added to the reaction mixture. The mixture is shaken. The aqueous layer is separated, and treated with an aqueous solution of sodium hydroxide to make the system alkalline, followed by extraction with methylene chloride. The organic layer is washed with water, dried, and concentrated under reduced pressure. The residue is recrystallized from methylene chloride to give 1-(3,4,5-trimethoxythiobenzoyl)piperazine as pale yellow crystals (1.3 g), m.p. 116°-118° C.

1. temperatureunder reflux
2. customThe aqueous layer is separated
3. additiontreated with an aqueous solution of sodium hydroxide
4. extractionfollowed by extraction with methylene chloride
5. washThe organic layer is washed with water
6. customdried
7. concentrationconcentrated under reduced pressure
8. customThe residue is recrystallized from methylene chloride