Sodium Carbonate → (3S,4R)-2-(3-benzyl-4-hydroxy-chroman-7-yl)-4-trifluoromethyl-benzoic acid 2,2-dimethylpropyl ester

HRID 277455Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 277455
[CH3:1][C:2]([CH3:21])([CH3:20])[CH2:3][O:4][C:5]([C:7]1[CH:12]=[CH:11][C:10]([C:13]([F:16])([F:15])[F:14])=[CH:9][C:8]=1B(O)O)=[O:6].[CH2:22]([C@@H:29]1[C@@H:38]([OH:39])[C:37]2[C:32](=[CH:33][C:34](Br)=[CH:35][CH:36]=2)[O:31][CH2:30]1)[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1.C(=O)([O-])[O-].[Na+].[Na+]>C1(C)C=CC=CC=1.O>[CH3:1][C:2]([CH3:21])([CH3:20])[CH2:3][O:4][C:5](=[O:6])[C:7]1[CH:12]=[CH:11][C:10]([C:13]([F:16])([F:15])[F:14])=[CH:9][C:8]=1[C:34]1[CH:33]=[C:32]2[C:37]([C@H:38]([OH:39])[C@@H:29]([CH2:22][C:23]3[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=3)[CH2:30][O:31]2)=[CH:36][CH:35]=1

Komponenten

6

Edukt 3

HCID 10340Sodium CarbonateHCID 11278601(3S,4R)-3-benzyl-7-bromo-chroman-4-olHCID 154622682-(Neopentyloxycarbonyl)-5-(trifluoromethyl)phenylboronic acid

Produkt 1

HCID 10918078(3S,4R)-2-(3-benzyl-4-hydroxy-chroman-7-yl)-4-trifluoromethyl-benzoic acid 2,2-dimethylpropyl esterAusbeute 84 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 962WaterLösungsmittel2×HCID 1140TolueneLösungsmittel

Versuchsvorschrift

A bi-phasic solution of 2-(2,2-dimethyl-propoxycarbonyl)-5-trifluoromethyl-benzeneboronic acid (1.72 g, 5.66 mmol), (3S,4R)-3-benzyl-7-bromo-chroman-4-ol(1.80 g, 5.63 mmol), sodium carbonate (1.82 g, 17.2 mmol), and tretrakis(triphenyl-phosphine)palladium(0) (12 mg, 0.19 mol %) in toluene (15 mL) and water (9 mL) was stirred at reflux for 100 minutes. The reaction mixture was cooled to room temperature, poured into water (40 mL) and extracted with diisopropylether (75 mL). The organic extracts were washed with brine (50 mL), treated with Darco® G-60, dried over magnesium sulfate, filtered through Celite®, and concentrated. The crude product was purified by chromatography on silica gel (ethyl acetate/hexanes 20/80) to provide (3S, 4R)-2-(3-benzyl-4-hydroxy-chroman-7-yl)-4-trifluoromethyl-benzoic acid 2,2-dimethylpropyl ester as a white foam (2.35 g, 84% yield): Rf: 0.32 (ethyl acetate/hexanes25/75); IR 3407 (br), 2961, 1721, 1336, 1292, 1252, 1172, 1134, 1110, 1022, 848, 749 cm−1; 1H NMR (400 MHz, CDCl3) δ7.90 (d, J=8.1 Hz, 1H), 7.66 (d, J=8.1 Hz, 1H), 7.63 (s, 1H), 7.19-7.37 (m, 6H), 6.88-6.93 (m, 2H), 4.53 (t,J=4.4 Hz, 1H), 4.22 (dd, J=11.2, 2.5 Hz, 1H), 3.99 (dd, J=11.2, 3.3 Hz, 1H), 3.78 (s, 2H), 2.73 (dd, J=13.8, 6.3 Hz, 1H), 2.54 (dd, J=13.6, 9.4 Hz, 1H), 2.20-2.80 (m, 1H), 1.81 (d, J=5.2 Hz, 1H), 0.74 (s, 9H); 13C NMR (100 MHz, CDCl3) δ26.64, 30.96, 34.62, 41.53, 64.76, 67.42, 75.33, 116.77, 121.07, 122.97, 124.13, 126.44, 127.50, 127.54, 128.45, 128.60, 128.92, 129.11, 130.25, 130.31, 139.08, 141.69, 142.03, 154.44, 168.14.

Aufarbeitung

  1. temperatureat reflux for 100 minutes
  2. extractionextracted with diisopropylether (75 mL)
  3. washThe organic extracts were washed with brine (50 mL)
  4. additiontreated with Darco® G-60
  5. dry with materialdried over magnesium sulfate
  6. filtrationfiltered through Celite®
  7. concentrationconcentrated
  8. customThe crude product was purified by chromatography on silica gel (ethyl acetate/hexanes 20/80)

Quellen und Nachweise

ORD-Eintrag
ord-826f1ebf6ded4f77af04d7932a25ed11
Quelldatensatz
uspto-grants-2002_03
Patentnummer
US06355825B1

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