反应详情

To a stirred solution of (1R)-2-[(3S)-3-(aminomethyl)-1-pyrrolidinyl]-1-[3-fluoro-6-(methyloxy)-1,5-naphthyridin-4-yl]ethanol (90 mg, 0.28 mmol) in dry CH2Cl2 (2 mL) and dry EtOH (2 mL) was added 3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]thiazine-6-carboxaldehyde (55 mg, 0.28 mmol) along with Na2SO4 (350 mg, 2.46 mmol). After 18 h at room temperature, NaBH4 (24 mg, 0.56 mmol) was added. After 2 h, the solution wa partitioned between ethyl acetate and the aqueous solution of sodium bicarbonate. The aqueous solution was extreacted several times with ethyl acetate. The organic fraction were pooled, concentrated and purified with column chromatography (silica, 0-8% MeOH in DCM (1% NH4OH)) affording a light yellow solid, which was completed with chiral purification. The title compound (5 mg, 3.6%) was provided as a white solid: LC/MS (ES) m/e 499 (M+H)+; 1H NMR (400 MHz, CD3OD): δ 8.56 (s, 1H), 8.14 (d, J=9.0 Hz, 1H), 7.57 (d, J=7.6 Hz, 1H), 7.10 (d, J=9.2 Hz, 1H), 6.89 (d, J=7.6 Hz, 1H), 5.82-5.84 (m, 1H), 4.03 (s, 3H), 3.64 (s, 2H), 3.39-3.41 (m, 1H), 3.09-3.12 (m, 1H), 2.87-3.07 (m, 2H), 2.59-2.67 (m, 2H), 2.48-2.52 (m, 2H), 2.28-2.36 (m, 2H), 1.86-1.97 (m, 1H), 1.37-1.46 (m, 1H), 1.16-1.18 (m, 1H).

1. waitAfter 2 h
2. customthe solution wa partitioned between ethyl acetate
3. concentrationconcentrated
4. custompurified with column chromatography (silica, 0-8% MeOH in DCM (1% NH4OH))
5. customaffording a light yellow solid, which
6. customwas completed with chiral purification