Benzoyl fluoride → 1-(3,3,3-Trifluoro-2-(methylamino)propyl)azetidin-3-yl benzoate

Beteiligte Stoffe

Reaktionsschritte

A solution of benzoyl fluoride (1.37 mL, 12.6 mmol) in DCM (5 mL) was added dropwise under argon to an ice cooled solution of 1-(3,3,3-trifluoro-2-(methylamino)propyl)azetidin-3-ol (Compound C3.1) (2.28 g, 11.5 mmol) and TEA (3.21 mL, 23 mmol) in DCM (45 mL). The stirring was continued at rt for 2.5 h. NaHCO3 (saturated, 20 mL) was added and the mixture was stirred vigorously for 40 min. The layers were separated, the aqueous layer was extracted with DCM, and the combined organic layers were washed with NaHCO3 (saturated), dried (Na2SO4) and concentrated under reduced pressure. The residue was purified by preparative HPLC. After concentrating the fractions to approximately 30 mL the aqueous emulsion was extracted DCM (×2). The combined organic layers were dried (Na2SO4) and concentrated under reduced pressure to give the title product (1.54 g, 44%.) as a colourless oil. 1H NMR (500 MHz, DMSO-d6) δ 7.97 (2H), 7.67 (1H), 7.53 (2H), 5.16 (1H), 3.7-3.79 (2H), 3.25 (1H), 3.18 (1H), 2.92-3.02 (1H), 2.66 (1H), 2.59 (1H), 2.38 (3H), 1.99-2.06 (1H).

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