反应详情

Sodium sulphite (12.6 g) in water (25 ml) was added to a stirred solution of benzyl 3-(bromomethyl)-1-piperidinecarboxylate (7.8 g) [Preparation 60] in dioxan (25 ml). The reaction mixture was stirred at reflux for 18 hrs, after which time the solvent was removed under reduced pressure and the residue partitioned between ethyl acetate and water. The aqueous solution was separated and acidified with 2N aqueous hydrochloric acid. The product was then extracted with ethyl acetate, dried over magnesium sulphate and the solvent removed under reduced pressure to afford 1-[(benzyloxy)carbonyl]-3-piperidylmethanesulfonic acid as a hygroscopic solid (4.5 g).

1. temperatureat reflux for 18 hrs
2. customafter which time the solvent was removed under reduced pressure
3. customthe residue partitioned between ethyl acetate and water
4. customThe aqueous solution was separated
5. extractionThe product was then extracted with ethyl acetate
6. dry with materialdried over magnesium sulphate
7. customthe solvent removed under reduced pressure