Citric Acid → (3-Chloro-4-cyano-2-methylphenyl)-D-threonine

HRID 470733

Reaktionsgleichung

Reaktionsgleichung von HRID 470733
[Cl:1][C:2]1[C:9]([CH3:10])=[C:8](F)[CH:7]=[CH:6][C:3]=1[C:4]#[N:5].[NH2:12][C@@H:13]([C:17]([OH:19])=[O:18])[C@H:14]([CH3:16])[OH:15].C([O-])([O-])=O.[K+].[K+].C(O)(=O)CC(CC(O)=O)(C(O)=O)O>CS(C)=O>[Cl:1][C:2]1[C:9]([CH3:10])=[C:8]([NH:12][C@H:13]([C@@H:14]([OH:15])[CH3:16])[C:17]([OH:19])=[O:18])[CH:7]=[CH:6][C:3]=1[C:4]#[N:5]

Komponenten

6

Edukt 4

HCID 311Citric AcidHCID 11430Potassium CarbonateHCID 69435D-ThreonineHCID 445509712-Chloro-4-fluoro-3-methylbenzonitrile

Produkt 1

HCID 57908671(3-Chloro-4-cyano-2-methylphenyl)-D-threonine

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 679Dimethyl SulfoxideLösungsmittel

Reaktionsbedingungen

Temperatur
75 °C

Versuchsvorschrift

2-chloro-4-fluoro-3-methylbenzonitrile (CAS 796600-15-2, 45 g, 265.4 mmol) was mixed together with H-D-Thr-OH (37.92 g, 318.4 mmol) in DMSO (250 mL). K2CO3 (73.35 g, 530.7 mmol) was added to the reaction mixture and the reaction mixture stirred at 75° C. for 24 h. The reaction mixture was cooled to room temperature and poured slowly into a 10% citric acid solution and stirred for 10 min at room temperature. The solution was extracted with EtOAc several times to get the crude product. The crude product was chromatographed on silica gel with a gradient of hexanes/EtOAc and then with EtOAc, 100% to get the purified final product (39.0 g, 54%) 1H NMR (500 MHz, Acetone-d6, δ in ppm) 7.49 (d, 9 Hz, 1H), 6.70 (d, J=9 Hz, 1H), 5.38 (d, J=10 Hz, 1H), 4.47 (d, J=6 Hz, 1H), 4.25 (m, 1H), 2.34 (s, 3H), 1.33 (d, J=6 Hz, 3H).

Aufarbeitung

  1. temperatureThe reaction mixture was cooled to room temperature
  2. stirringstirred for 10 min at room temperature
  3. extractionThe solution was extracted with EtOAc several times
  4. customto get the crude product
  5. customThe crude product was chromatographed on silica gel with a gradient of hexanes/EtOAc
  6. customwith EtOAc, 100% to get the
  7. custompurified final product (39.0 g, 54%) 1H NMR (500 MHz, Acetone-d6, δ in ppm) 7.49 (d, 9 Hz, 1H), 6.70 (d, J=9 Hz, 1H), 5.38 (d, J=10 Hz, 1H), 4.47 (d, J=6 Hz, 1H), 4.25 (m, 1H), 2.34 (s, 3H), 1.33 (d, J=6 Hz, 3H)

Quellen und Nachweise

ORD-Eintrag
ord-0996d674fb3d4ce791bf780f0a387e78
Quelldatensatz
uspto-grants-2014_01
Patentnummer
US08629167B2

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