Potassium Carbonate → (2R,3R)-2-(4-Cyanonaphthalen-1-ylamino)-3-hydroxybutanoic acid

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a suspension of D-allo-threonine (2.09 g, 17.53 mmol) and K2CO3 (4.04 g, 29.21 mmol) in DMSO (40 mL) was added 4-fluoro-1-naphthonitrile (CAS 13916-99-9, 2.50 g, 14.61 mmol) at room temperature. The reaction mixture was heated to 80° C. and stirred for 89 h. The reaction mixture was allowed to cool to room temperature, quenched with H2O (150 mL) and extracted with EtOAc (3×100 mL). The aqueous layer was then acidified with solid citric acid and extracted with EtOAc (2×100 mL). The later organic extracts were combined, washed with H2O (3×100 mL), dried (Na2SO4), filtered and concentrated under reduced pressure to provided the title compound as a light brown solid (3.0 g, 76%): 1H NMR (400 MHz, DMSO-d6, δ in ppm) 8.46 (d, J=8.8 Hz, 1H), 7.97 (d, J=8.2 Hz, 1H), 7.90 (d, J=8.6 Hz, 1H), 7.74 (t, J=7.0 Hz, 1H), 7.62 (t, J=7.6 Hz, 1H), 6.98 (d, J=8.0 Hz, 1H), 6.57 (d, J=8.4 Hz, 1H), 4.29-4.20 (m, 1H), 4.08-3.99 (m, 1H), 1.28 (d, J=6.1 Hz, 3H).

Herkunft & Nachweise