To a solution of tert-butyl 2-(4Z,7Z,10Z,13Z,16Z,19Z)-docosa-4,7,10,13,16,19-hexaenamidopropylcarbamate (2.10 g, 4.34 mmol) in DCM (100 mL) at 0° C. was slowly added TFA (30 mL). The mixture was stirred (0° C., 2 h), warmed to RT and stirred (16 h). The mixture was basified to pH=10 with saturated aqueous Na2CO3 and extracted with EA (2×200 mL). The combined organic layers were dried over MgSO4, filtered and concentrated under reduced pressure to afford (4Z,7Z,10Z,13Z,16Z,19Z)-N-(1-aminopropan-2-yl)docosa-4,7,10,13,16,19-hexaenamide (1.60 g, 98%) as a light yellow oil. Mass calculated for C25H40N2O=384.6. found: [M+H]+=385.2.
