Hydrochloric Acid → 2-Methoxy-3'-carboethoxy-[1,1'-biphenyl]-6-carboxylic acid, ethyl ester

HRID 275172Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 275172
[CH3:1][O:2][C:3]1[CH:8]=[CH:7][CH:6]=[C:5]([C:9]([OH:11])=[O:10])[C:4]=1[C:12]1[CH:17]=[CH:16][CH:15]=[C:14]([C:18]([O:20][CH2:21][CH3:22])=[O:19])[CH:13]=1.Cl.[CH3:24][CH2:25]OC(C)=O.CCCCCC>CCO>[CH3:1][O:2][C:3]1[CH:8]=[CH:7][CH:6]=[C:5]([C:9]([O:11][CH2:24][CH3:25])=[O:10])[C:4]=1[C:12]1[CH:17]=[CH:16][CH:15]=[C:14]([C:18]([O:20][CH2:21][CH3:22])=[O:19])[CH:13]=1

Komponenten

5

Edukt 3

HCID 313Hydrochloric AcidHCID 152329332-Methoxy-3'-carboethoxy-[1,1'-biphenyl]-6-carboxylic acidHCID 21226206Ethyl acetate hexane

Produkt 1

HCID 867484752-Methoxy-3'-carboethoxy-[1,1'-biphenyl]-6-carboxylic acid, ethyl esterAusbeute 73 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 702EthanolLösungsmittel

Versuchsvorschrift

Acid 5a (0.583 g., 1.90 mmol, 1 equiv.) is dissolved in 12 mL of absolute EtOH. Concentrated HCl (0.6 mL) is added, and the mixture heated to reflux for 24 hours. The mixture is then partitioned between EtOAc and water. The organic phase is washed with brine, dried (MgSO4), and concentrated in vacuo. Chromatography on silica gel using 5%, then 10% EtOAc/hexane yields 2-methoxy-3'-carboethoxy-[1,1'-biphenyl]-6-carboxylic acid, ethyl ester (6a) (0.432 g., 1.32 mmol, 73%) as a clear oil: UVmax (CHCl3) 242 nm (ε=12036), 296 nm (ε=4724); 1H NMR (300 MHz, CDCl3) δ 8.01 (m, 1H, ArH), 7.92 (m, 1H, ArH), 7.47-7.40 (m, 3H, ArH), 7.39 (dd, J=8, 8 Hz, 1H, ArH), 7.09 (dd, J= 2, 8 Hz, 1H, ArH), 4.34 (q, J=7 Hz, 2H, CO2CH2), 3.98 (q, J=7 Hz, 2H, CO2CH2), 3.73 (s, 3H, OCH3), 1.35 (t, J=7 Hz, 3H, CH2CH3), 0.91 (t, J=7 Hz, 3H, CH2CH3); 13C NMR (75 MHz, CDCl3) δ 168.04 (C=O), 166.65 (C=O), 156.92, 137.28, 134.11, 133.22, 130.73, 130.07, 129.98, 128.78, 128.22, 127.63, 121.63, 113.87, 60.88, 56.02, 14.34, 13.65; IR (film) 2982, 1718, 1466, 1366, 1298, 1260, 1234, 1110, 1060 cm-1 ; MS (DCI) m/e 329 (MH+), 283 (M--C2H5O). Anal. Calcd for C19H20O5 : C, 69.50; H, 6.14. Found: C, 69.44; H, 6.19.

Aufarbeitung

  1. temperaturethe mixture heated
  2. temperatureto reflux for 24 hours
  3. customThe mixture is then partitioned between EtOAc and water
  4. washThe organic phase is washed with brine
  5. dry with materialdried (MgSO4)
  6. concentrationconcentrated in vacuo

Quellen und Nachweise

ORD-Eintrag
ord-6443cfb4ba7241ae96d486ebe5db8617
Quelldatensatz
uspto-grants-1995_02
Patentnummer
US05391817

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