Lithium Hydroxide → 2-methyl-1-[(2-methylphenyl)methyl]-6-(4-morpholinyl)-1H-benzimidazole-4-carboxylic acid

HRID 44536

Reaktionsgleichung

Reaktionsgleichung von HRID 44536
[CH3:1][C:2]1[NH:6][C:5]2[C:7]([C:17]([O:19]C)=[O:18])=[CH:8][C:9]([N:11]3[CH2:16][CH2:15][O:14][CH2:13][CH2:12]3)=[CH:10][C:4]=2[N:3]=1.[CH3:21][C:22]1[CH:29]=[CH:28][CH:27]=[CH:26][C:23]=1[CH2:24]Br.C(=O)([O-])[O-].[K+].[K+].[OH-].[Li+]>CN(C)C=O.O1CCCC1.O>[CH3:1][C:2]1[N:3]([CH2:21][C:22]2[CH:29]=[CH:28][CH:27]=[CH:26][C:23]=2[CH3:24])[C:4]2[CH:10]=[C:9]([N:11]3[CH2:12][CH2:13][O:14][CH2:15][CH2:16]3)[CH:8]=[C:7]([C:17]([OH:19])=[O:18])[C:5]=2[N:6]=1

Komponenten

8

Edukt 4

HCID 3939Lithium HydroxideHCID 6992o-Xylyl bromideHCID 11430Potassium CarbonateHCID 178498372HCID 178498372, Verbindung

Produkt 1

HCID 569605392-methyl-1-[(2-methylphenyl)methyl]-6-(4-morpholinyl)-1H-benzimidazole-4-carboxylic acidAusbeute 57,5 %

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 962WaterLösungsmittelHCID 6228DimethylformamideLösungsmittelHCID 8028TetrahydrofuranLösungsmittel

Reaktionsbedingungen

Temperatur
80 °C

Versuchsvorschrift

To a solution of methyl 2-methyl-5-(4-morpholinyl)-1H-benzimidazole-7-carboxylate, prepared as described in Example 26, step d (0.2 g, 0.726 mmol) in N,N-Dimethylformamide (DMF) (10 mL) was added 2-methylbenzyl bromide (0.145 mL, 1.090 mmol) and potassium carbonate (0.301 g, 2.179 mmol). The resulting reaction mixture was stirred for 3 h at 80° C. The solution was cooled to room temperature and poured into water and was extracted with EtOAc. The combined organic phase was washed with Brine and concentrated. The residue was purified on a Biotage Isolera purification system using a Biotage 10 g SNAP silica gel cartridge and eluted with a gradient of DCM to 5% MeOH/DCM over 10 column volumes. The expected compound was collected and evaporated to yield a tan solid. The tan solid was dissolved in tetrahydrofuran (THF) (10.00 mL) followed by the addition of 1M lithium hydroxide solution (10 mL, 10 mmol). The reaction was stirred at 50° C. for 2 h. The reaction was cooled to room temperature and the organic solvent was removed in-vacuo. The solution was diluted with water (20 mL) and acidified with 1 N HCl. The mixture was then filtered and the grey solid was purified by reversed phase HPLC with a gradient of acetonitrile (0.1% TFA) and water (0.1% TFA v/v) (10-40%) over 10 minutes. The appropriate fractions were collected and evaporated to yield the desired product (152.6 mg, 0.418 mmol, 57.5% yield). 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 2.45 (s, 3H) 2.87 (s, 3H) 3.00 (br. s., 4H) 3.72-3.81 (m, 4H) 5.53 (s, 2H) 6.60 (d, J=7.58 Hz, 1H) 6.78 (d, J=1.26 Hz, 1H) 7.14 (t, 1H) 7.23-7.33 (m, 3H). MS (ES+) m/e 365.8 [M+H]+.

Aufarbeitung

  1. customThe resulting reaction mixture
  2. temperatureThe solution was cooled to room temperature
  3. extractionwas extracted with EtOAc
  4. washThe combined organic phase was washed with Brine
  5. concentrationconcentrated
  6. customThe residue was purified on a Biotage Isolera purification system
  7. washeluted with a gradient of DCM to 5% MeOH/DCM over 10 column volumes
  8. customThe expected compound was collected
  9. customevaporated
  10. customto yield a tan solid
  11. stirringThe reaction was stirred at 50° C. for 2 h
  12. temperatureThe reaction was cooled to room temperature
  13. customthe organic solvent was removed in-vacuo
  14. additionThe solution was diluted with water (20 mL)
  15. filtrationThe mixture was then filtered
  16. customthe grey solid was purified by reversed phase HPLC with a gradient of acetonitrile (0.1% TFA) and water (0.1% TFA v/v) (10-40%) over 10 minutes
  17. customThe appropriate fractions were collected
  18. customevaporated

Quellen und Nachweise

ORD-Eintrag
ord-c18aa23d9c8b4a169f22e611da24c77e
Quelldatensatz
uspto-grants-2013_09
Patentnummer
US08541411B2

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