Hydrochloric Acid → (R)-1-(2-((2,2-Diphenylethenyl)oxy)ethyl)-3-piperidinecarboxylic acid hydrochloride

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Reaction Steps

(R)-1-[2-[[2,2-Diphenylethenyl]oxy]ethyl]-3-piperidine carboxylic acid ethyl ester (example 1) (3.0 g, 0.079 mol) was dissolved in ethanol (20 ml) and 12N sodium hydroxide solution (2.0 ml) was introduced. After stirring the solution at room temperature for 2.5 h, 37% hydrochloric acid (ca. 2.2 ml) was added, with acidity measured at pH 2. Dichloromethane (300 ml) was introduced, and the mixture was dried (MgSO4). Filtration and evaporation of the filtrate gave a solid, which was triturated with diethyl ether, to give the title compound (2.65 g, 86%) as a white solid, m.p. 210°-216° C.

Provenance & Evidence