Sodium Carbonate → Carbamic acid, [3-[(cyanomethyl)amino]propyl]-, 1,1-dimethylethyl ester

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Reaction Steps

A solution of (3-aminopropyl)carbamic acid 1,1-dimethylethyl ester (6.00 g, 34 mmol), prepared by the method of Saari et al., J. Med. Chem., 33, 97 (1990), in absolute ethanol (90 mL) was treated with sodium carbonate (3.96 g, 37 mmol) followed by a solution of bromoacetonitrile (2.6 mL, 37 mmol) in ethanol (30 mL) over 45 min. After stirring at room temperature overnight, the contents of the flask were filtered, preadsorbed onto silica gel, and purified by flash chromatography (7 cm diameter, elution with 2.5% methanol in dichloromethane) to afford [3-(cyanomethylamino)propyl]carbamic acid 1,1-dimethylethyl ester as a yellow oil (3.99 g, 55%); IR (neat, cm-1): 3330, 2240, 1700; MS (+CI): 214 (MH+, 20), 187 (76), 158 (100), 131 (44); 1H NMR (CDCl3, 400 MHz): δ 4.80 (br s, NH), 3.61 (s, 2H), 3.22 (q, J=6.5 Hz, 2H), 2.79 (t, J=6.5 Hz, 2H), 1.69 (p, J=6.5 Hz, 2H), 1.45 (s, 9H).

Provenance & Evidence