Trifluoroacetic acid → HCID 71726518, compound

Participants

Reaction Steps

To a stirred solution of (S)-tert-butyl (1-((4-acetamido-5H-chromeno[3,4-c]pyridin-8-yl)oxy)-4-methylpentan-2-yl)carbamate (150 mg, 0.329 mmol) in CH2Cl2 (10 mL) at room temperature was added TFA (0.025 mL, 0.329 mmol) and the solution was stirred at room temperature for 3 h. The solution was concentrated under reduced pressure and the sample was purified by preparative HPLC (0.1% TFA in water and methanol) yielding (S)—N-(8-((2-amino-4-methylpentyl)oxy)-5H-chromeno[3,4-c]pyridin-4-yl)acetamide (40 mg, 0.113 mmol, 33% yield for three steps) as an off-white solid. 1H NMR (400 MHz, CD3OD) δ 8.34 (d, J=5.3 Hz, 1H), 7.81 (d, J=8.7 Hz, 1H), 7.58 (d, J=5.4 Hz, 1H), 6.77 (m, 1H), 6.63 (d, J=2.4 Hz, 1H), 4.94 (s, 2H), 4.03 (m, 1H), 3.85 (m, 1H), 3.33 (m, 1H), 2.21 (s, 3H), 1.81 (m, 1H), 1.43 (m, 2H), 0.99 (m, 6H); LCMS (ESI) m/e 356.2 [(M+H)+, calcd for C20H26N3O3 356.2]; LC/MS retention time (Method C): tR=1.26 min; HPLC retention time (method A): tR=8.02 min; HPLC retention time (method B): tR=9.08 min.

Provenance & Evidence