反应详情

A reaction mixture consisting of 1.0 gm. (0.0035 mole) of 4-methylamino-4-phenylcyclohexanone, ethylene ketal, hydrochloride (prepared in Example 17, Part G, above) 2.0 ml. of 2.5 N hydrochloric acid, and 20 ml. acetone is stirred continuously for eighteen (18) hours, at 25° C. The reaction mixture is then made basic by adding solid sodium bicarbonate, and most of the solvent is removed by evaporation under reduced pressure. The concentrated material thus obtained is ectracted four times with 20 ml. portions of methylene chloride. the extracts are combined and the methylene chloride is removed by evaporation under reduced pressure. A gummy residue is obtained that is dissolved in diethyl ether. The ether solution is treated with hydrogen chloride in ether. A precipitate forms which is collected on a filter and recrystallized from a mixture of methylene chloride and ethyl acetate. There is thus obtained 0.53 gm. (74% yield) of 4-methylamino-4-phenylcyclohexanone hydrochloride having a melting range from 218° to 220° C.

1. custommost of the solvent is removed by evaporation under reduced pressure
2. customThe concentrated material thus obtained
3. customthe methylene chloride is removed by evaporation under reduced pressure
4. customA gummy residue is obtained
5. customA precipitate forms which is collected on
6. filtrationa filter
7. customrecrystallized from a mixture of methylene chloride and ethyl acetate