Trifluoroacetic acid → US9611269, Example 22

Participants

Reaction Steps

To a solution of 4-{3-(cyanomethyl)-3-[4-(7-{[2-(trimethylsilyl)ethoxy]methyl}-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]azetidin-1-yl}-2-fluorobenzoic acid (25 mg, 0.046 mmol) (Example 15, Step 2) and N,N-diisopropylethylamine (24 μL, 0.14 mmol) in 1,2-dichloroethane (0.5 mL) was added sequentially N,N,N′,N′-tetramethyl-O-(7-azabenzotriazol-1-yl)uronium hexafluorophosphate (26 mg, 0.068 mmol) and (2S)-1,1,1-trifluoropropan-2-amine (12 mg, 0.11 mmol). After stirring at ambient temperature for 1.5 h, trifluoroacetic acid (0.5 mL) was added to the reaction mixture and stirring was continued for 1 h. The volatiles were removed in-vacuo and the residue was azeotropically washed with acetonitrile (3×3 mL). The resulting residue was dissolved in methanol (1 mL) and to this was added ammonium hydroxide (0.1 mL) and ethylenediamine (0.020 mL) and the reaction mixture was stirred at ambient temperature for 1 hour. The crude reaction mixture was subjected to RP-HPLC to afford the desired product. LCMS (M+H)+: m/z=513.1. 1H NMR (500 MHz, DMSO-d6): δ 12.64 (s, 1H), 9.06 (s, 1H), 8.85 (s, 1H), 8.56 (s, 1H), 8.33 (dd, J=8.9, 1.8 Hz, 1H), 7.79 (s, 1H), 7.52 (t, J=8.5 Hz, 1H), 7.23 (s, 1H), 6.47 (s, 1H), 6.45-6.42 (m, 1H), 4.83-4.75 (m, 1H), 4.59 (dd, J=8.9, 1.7 Hz, 2H), 4.34 (d, J=8.9 Hz, 2H), 3.77 (s, 2H), 1.31 (d, J=7.1 Hz, 3H).

Provenance & Evidence