Triethylamine → Methyl 6-(2,2,2-trifluoroacetamido)hexanoate

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To a 2 liter round bottom flask, charged with 100.2 g (0.552 mol) of amine hydrochloride 2 and 1 liter of methanol was added 100 g (0.703 mol) of ethyl trifluoroacetate followed by 120 mL (0.861 mol) of triethylamine. The mixture was stirred at 20-30° C. for 19 h and then concentrated via rotary evaporation. The residue was diluted with 500 mL of diethyl ether and then filtered. The filtrate was washed with 3×300 mL aliquots of 1N aqueous HCl, 200 mL of de-ionized water, 2×200 mL aliquots of saturated aqueous sodium bicarbonate and finally with 200 mL of de-ionized water. The organic phase was dried over anhydrous magnesium sulfate, filtered and concentrated. The residue was distilled under vacuum to afford 115.8 g of the product (3) as a colorless oil: b.p.=113-116° C. at 120 mm Hg: 1H NMR (d6-DMSO) d 3.57 (3H, s), 2.75 (2H, m), 2.29 (2H, t), 1.60-1.40 (4H, m) and 1.37-1.19 (2H, m) ppm.

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