Hydrochloric Acid → 9-[(2-Fluorophenyl)methyl]-4-hydroxy-5-carbamoyl carbazole

HRID 51372Notes

Reaction equation

HRID 51372 reaction equation
[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[CH2:8][N:9]1[C:21]2[CH:20]=[CH:19][CH:18]=[C:17]([OH:22])[C:16]=2[C:15]2[C:10]1=[CH:11][CH:12]=[CH:13][C:14]=2[C:23]([O:25]C)=O.Cl.[OH-].[NH4+:29]>C1COCC1.C(OCC)(=O)C>[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[CH2:8][N:9]1[C:21]2[CH:20]=[CH:19][CH:18]=[C:17]([OH:22])[C:16]=2[C:15]2[C:10]1=[CH:11][CH:12]=[CH:13][C:14]=2[C:23](=[O:25])[NH2:29]

Participants

6

Reactant 3

HCID 313Hydrochloric AcidHCID 14923Ammonium HydroxideHCID 227400609-[(2-Fluorophenyl)methyl]-4-hydroxy-5-carbomethoxy carbazole

Product 1

HCID 227385489-[(2-Fluorophenyl)methyl]-4-hydroxy-5-carbamoyl carbazoleYield 40%

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolvent

Procedure

A solution of the 9-[(2-fluorophenyl)methyl]-4-hydroxy-5-carbomethoxy carbazole (237.5 mg, 0.68 mM) in 10 mL THF and 40 mL concentrated aqueous ammonium hydroxide was sonicated for 20 h at 40-50° C. The mixture was diluted with ethyl acetate and acidified to pH 1 with 5 N HCl. The aqueous layer was extracted twice with ethyl acetate. The combined organic extracts were washed with saturated brine, dried over magnesium sulfate, filtered, and concentrated. The residue was purified by column chromatography on silica gel (elution with gradient methylene chloride/ethyl acetate) to afford 89.7 mg (40%) of the 9-[(2-fluorophenyl)methyl]-4-hydroxy-5-carbamoyl carbazole as a white solid. 1H NMR (DMSO-d6) δ10.5 (s, 1H), 8.8 (br s, 1H), 8.4 (br s, 1H), 7.8 (dd, 1H, J=1 and 8 Hz), 7.5-6.9 (m, 7H), 6.65 (m, 2H), and 5.75 (s, 2H). IR (KBr, cm−1) 3395, 3192 (br), 1621, 1599, 1580, 1564, 1491, 1455, 1334, 1261, and 774. MS (ES) m/e 333, 335.

Workup

  1. extractionThe aqueous layer was extracted twice with ethyl acetate
  2. washThe combined organic extracts were washed with saturated brine
  3. dry with materialdried over magnesium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe residue was purified by column chromatography on silica gel (elution with gradient methylene chloride/ethyl acetate)

Sources & evidence

ORD record
ord-1e346ae69d364231b0f5a355547e845e
Source dataset
uspto-grants-2004_03
Patent number
US06713645B1

Reaction notes

Loading…