Water → 2-(1,2,3,4,10,14b-Hexahydrodibenzo[c,f]pyrazino[1,2-a]azepin-2-yl)ethoxyacetic acid

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Reaction Steps

7 ml of a 10 % w/v aqueous solution of sodium hydroxide and 10 ml of water were added to a solution of 3.2 g of ethyl 2-(1,2,3,4,10,14b-hexahydrodibenzo[c,f]pyrazino[1,2-a]azepin-2-yl)ethoxyacetate (prepared as described in Example 1) dissolved in 20 ml of ethanol. The mixture was then stirred at room temperature for 1 hour, after which it was concentrated to about one half of its original volume by distillation under reduced pressure. The pH of the concentrate was then adjusted to a value of 4.0 by the addition of 10% w/v aqueous hydrochloric acid, and the mixture was extracted with chloroform. Concentration of the extract by evaporation under reduced pressure yielded 2.96 g (a quantitative yield) of the title compound as a foamy substance, which was recrystallized from water to give colorless needles, melting at 135° C. (with decomposition).

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