反应详情

5.0 g of 1-(m-methoxyphenyl)-N-methyl-2-cyclohexene-1-ethylamine are treated with a mixture of 1.5 liters of 35% aqueous formaldehyde solution and 2.0 ml of 90% formic acid, and the resulting mixture is held at 100° C. for 2 hours. After distillation of the solvent, the residue is treated with 1 N hydrochloric acid solution. The neutral portion is taken up in ether, the aqueous phase is made alkaline by the addition of 3 N sodium hydroxide and the rac. 1-(m-methoxyphenyl)-N,N-dimethyl-2-cycloexene-1-ethylamine is taken up in methylene chloride. After distillation of the solvent, the oil obtained is purified on a 10-fold amount of aluminium oxide. The fractions eluted with toluene are combined and evaporated, and pure rac. 1-(m-methoxyphenyl)-N,N-dimethyl-2-cyclohexene-1-ethylamine remains as the residue. The hydrochloride of this compound melts at 161°-162° C. (after recrystallization from ethyl acetate/ethanol).

1. distillationAfter distillation of the solvent
2. additionthe residue is treated with 1 N hydrochloric acid solution
3. additionby the addition of 3 N sodium hydroxide
4. distillationAfter distillation of the solvent
5. customthe oil obtained
6. customis purified on a 10-fold amount of aluminium oxide
7. washThe fractions eluted with toluene
8. customevaporated