To a cold (0°C) solution of trifluoroacetic acid (2.5 ml) and CH2Cl2 (7.5 ml) was added tert-butyl (2-(heptylamino)ethyl)carbamate (0.5 g, 1.9 mmol), then the mixture was warmed to room temperature and stirred for 2 h. The solution was concentrated in vacuo and used directly in the next step without further purification.
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