Hydrochloric Acid → HCID 21188365, compound

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Reaction Steps

2 g (0.0066 mol) of tert-butyl 4-(2-methoxycarbonylmethoxyethyl)piperazine-1-carboxylate prepared in Example I.4.3. are dissolved in 5 ml of ethyl acetate in a 50 ml three-necked round-bottomed flask fitted with a water-cooled condenser and a mechanical stirrer. 20 ml of a 3M solution of hydrochloric acid in ethyl acetate are added in a single portion with stirring. The mixture is stirred at room temperature for 30 minutes. 5 ml of a 3M solution of hydrochloric acid in ethyl acetate are then added and stirring is continued for 30 minutes. The precipitate is filtered off and is washed with 2×5 ml of ethyl acetate. 1.68 g (93%) of methyl 2-(1-piperazinyl)ethoxyacetate dihydrochloride are obtained in the form of a beige-colored solid. NMR: δ: 3.4 (2H, t, 4.8 Hz), 3.47-3.65 (8H, m); 3.67 (3H, s); 3.92 (2H, t, 4.8 Hz); 4.21 (2H, s); 10.1 (2H, bs). Mass spectrum: 202 (M+·).

Provenance & Evidence