Toluene → ethyl 6-chloro-8-(4-chlorophenyl)-2-(trifluoromethyl)-2H-1-benzopyran-3-carboxylate

HRID 722325

Reaktionsgleichung

Reaktionsgleichung von HRID 722325
[Cl:1][C:2]1[CH:3]=[C:4](I)[C:5]2[O:10][CH:9]([C:11]([F:14])([F:13])[F:12])[C:8]([C:15]([O:17][CH2:18][CH3:19])=[O:16])=[CH:7][C:6]=2[CH:20]=1.C(=O)([O-])[O-].[K+].[K+].[Cl:28][C:29]1[CH:34]=[CH:33][C:32](B(O)O)=[CH:31][CH:30]=1.C1(C)C=CC=CC=1>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.C(OCC)(=O)C>[Cl:1][C:2]1[CH:3]=[C:4]([C:32]2[CH:33]=[CH:34][C:29]([Cl:28])=[CH:30][CH:31]=2)[C:5]2[O:10][CH:9]([C:11]([F:14])([F:13])[F:12])[C:8]([C:15]([O:17][CH2:18][CH3:19])=[O:16])=[CH:7][C:6]=2[CH:20]=1

Komponenten

7

Edukt 4

HCID 1140TolueneHCID 11430Potassium CarbonateHCID 742994-Chlorophenylboronic acidHCID 21883552ethyl 6-chloro-8-iodo-2-(trifluoromethyl)-2H-chromene-3-carboxylate

Produkt 1

HCID 21883623ethyl 6-chloro-8-(4-chlorophenyl)-2-(trifluoromethyl)-2H-1-benzopyran-3-carboxylateAusbeute 64 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 178418397HCID 178418397, VerbindungKatalysatorHCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

Ethyl 6-chloro-8-iodo-2-(trifluoromethyl)-2H-1-benzopyran-3-carboxylate (Example 73, Step 2) (1.3 g, 3.02 mmol), potassium carbonate (1.25 g, 9.06 mmol), 4-chorophenylboronic acid (0.52 g, 3.33 mmol), and tetrakis(triphenylphosphine)palladium(0) (0.174 g, 0.151 mmol) were added to toluene (30 mL) and the resulting solution was heated to reflux for 18 hours. After cooling to room temperature the reaction mixture was poured into ethyl acetate (50 mL). It was washed with 1 N HCl (2×25 mL), saturated aqueous sodium bicarbonate (2×25 mL), and water (2×25 mL). The organic phase was dried over MgSO4, filtered, and concentrated in vacuo to yield a brown oil. The crude material was purified by flash chromatography using 1% ethyl acetate in hexane yielding a white solid. Recrystallization from hexane afforded the ester as a white solid (0.79 g, 64%): mp 114.2–115.9° C. 1H NMR (CDCl3/300 MHz) 7.69 (s, 1H), 7.41 (s, 4H), 7.30 (d, 1H, J=2.4 Hz), 7.22 (d, 1H, J=2.6 Hz), 5.70 (q, 1H, J=6.9 Hz), 4.37–4.29 (m, 2H), 1.35 (t, 3H, J=7.1 Hz). ESLRMS m/z 434 (M+NH4+). FABHRMS m/z 434.0574 (M+NH4+, Calc'd. 434.0538). Anal. Calc'd. for C19H13Cl2F3O3: C, 54.70; H, 3.14; Cl, 17.00. Found: C, 54.79; H, 3.18; Cl, 16.65.

Aufarbeitung

  1. temperaturethe resulting solution was heated
  2. temperatureto reflux for 18 hours
  3. washIt was washed with 1 N HCl (2×25 mL), saturated aqueous sodium bicarbonate (2×25 mL), and water (2×25 mL)
  4. dry with materialThe organic phase was dried over MgSO4
  5. filtrationfiltered
  6. concentrationconcentrated in vacuo
  7. customto yield a brown oil
  8. customThe crude material was purified by flash chromatography
  9. customRecrystallization from hexane

Quellen und Nachweise

ORD-Eintrag
ord-ffc67a530ec345e4a8aeaff2d0fc2a71
Quelldatensatz
uspto-grants-2006_11
Patentnummer
US07138411B2

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