Cesium carbonate → Methyl 6-methoxycarbonylmethoxy-2-naphthoate

HRID 23233

Reaktionsgleichung

Reaktionsgleichung von HRID 23233
[CH3:1][O:2][C:3]([C:5]1[CH:14]=[CH:13][C:12]2[C:7](=[CH:8][CH:9]=[C:10]([OH:15])[CH:11]=2)[CH:6]=1)=[O:4].C([O-])([O-])=O.[Cs+].[Cs+].Br[CH2:23][C:24]([O:26][CH3:27])=[O:25]>CC(C)=O.CCOC(C)=O>[CH3:1][O:2][C:3]([C:5]1[CH:14]=[CH:13][C:12]2[C:7](=[CH:8][CH:9]=[C:10]([O:15][CH2:23][C:24]([O:26][CH3:27])=[O:25])[CH:11]=2)[CH:6]=1)=[O:4]

Komponenten

6

Edukt 3

HCID 10796Cesium carbonateHCID 60984Methyl bromoacetateHCID 390995Methyl 6-hydroxy-2-naphthoate

Produkt 1

HCID 18702924Methyl 6-methoxycarbonylmethoxy-2-naphthoateAusbeute 85 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 180AcetoneLösungsmittelHCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

To a stirred solution of 6-hydroxy-2-naphthoic acid methyl ester (0.500 g, 2.47 mmol) in acetone (25 mL) at rt was added Cs2CO3 (0.886 g, 2.72 mmol) followed by methyl bromoacetate (0.257 mL, 2.72 mmol) dropwise. After 18 h at this temperature, it was diluted with EtOAc (200 mL). This layer was washed with 1 N HCl (20 mL), sat. aq. NaHCO3 (20 mL), and brine (20 mL) and then dried (MgSO4). After concentration, the residue was recrystallized from MeOH:H2O to afford the product (0.573 g, 85%) as a solid; 1H NMR (DMSO-d6) δ3.71 (s, 3H), 3.87 (s, 3H), 4.95 (s, 2H), 7.30 (dd, J=2.6, 8.9 Hz, 1H), 7.38 (d, J=2.4 Hz, 1H), 7.87 (d, J=8.7 Hz, 1H), 7.92 (dd, J=1.6, 8.6 Hz, 1H), 8.06 (d, J=9.1 Hz, 1H), 8.55 (s, 1H); mass spectrum [(+) ESI], m/z 275 (M+H)+.

Aufarbeitung

  1. washThis layer was washed with 1 N HCl (20 mL), sat. aq. NaHCO3 (20 mL), and brine (20 mL)
  2. dry with materialdried (MgSO4)
  3. concentrationAfter concentration
  4. customthe residue was recrystallized from MeOH

Quellen und Nachweise

ORD-Eintrag
ord-afc1d9bee9814a05b930b7c13a07bb3f
Quelldatensatz
uspto-grants-2005_02
Patentnummer
US06849761B2

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