Citric Acid → HCID 178510428, Verbindung

Temperatur

80 °C

To a mixture of 2-{4-[(4-cyano-1H-imidazole-2-carbonyl)-amino]-3-cyclohex-1-enyl-phenyl}-malonic acid dimethyl ester (as prepared in the previous step, 30.0 mg, 0.0710 mmol) and NaBH4 (13.4 mg, 0.355 mmol) in 1 mL of tert-butyl alcohol (t-BuOH) at 80° C. was added MeOH (50 μL) over 5 min. The resulting mixture was stirred at 80° C. for 16 h under Ar. After cooling to RT, the mixture was treated with 10% aq citric acid to a pH of 7. The mixture was then treated with 30 mL of EtOAc, washed with H2O (5 mL) and brine (10 mL). The organic layer was dried (Na2SO4) and concentrated in vacuo. The residue was purified by flash chromatography on silica gel with 1-5% MeOH-DCM to afford 14.1 mg (61%) of the title compound as a white solid: 1H-NMR (CD3OD; 400 MHz): δ 8.00 (s, 1H), 7.54 (dd, 1H, J=8.2, 2.3 Hz), 7.46 (d, 1H, J=2.3 Hz), 7.27 (d, 1H, J=8.2 Hz), 5.59 (m, 1H), 3.71-3.84 (m, 4H), 3.29 (m, 1H), 2.15-2.29 (m, 4H), 1.67-1.84 (m, 4H). Mass spectrum (ESI, m/z): Calcd. for C20H22N4O3, 367.2 (M+H). found 366.8.

1. temperatureAfter cooling to RT
2. washwashed with H2O (5 mL) and brine (10 mL)
3. dry with materialThe organic layer was dried (Na2SO4)
4. concentrationconcentrated in vacuo
5. customThe residue was purified by flash chromatography on silica gel with 1-5% MeOH-DCM

ORD-Eintrag

ord-385f373f052e430dba37ddd27d572484

Quelldatensatz

uspto-grants-2014_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08759347B2