Acetic Acid → 3-{[(Benzyloxy)carbonyl]amino}-7-bromoquinoline-2-carboxylic acid

HRID 924365Notes

Reaction equation

[CH2:1]([O:8][C:9]([NH:11][C:12]1[C:13]([C:23]([O:25]CC)=[O:24])=[N:14][C:15]2[C:20]([CH:21]=1)=[CH:19][CH:18]=[C:17]([Br:22])[CH:16]=2)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[O-]P([O-])([O-])=O.[K+].[K+].[K+].O1CCOCC1.CC(O)=O>O>[CH2:1]([O:8][C:9]([NH:11][C:12]1[C:13]([C:23]([OH:25])=[O:24])=[N:14][C:15]2[C:20]([CH:21]=1)=[CH:19][CH:18]=[C:17]([Br:22])[CH:16]=2)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

Conditions

Temperature: 100 °C

Procedure

To a mixture of ethyl 3-{[(benzyloxy)carbonyl]amino}-7-bromoquinoline-2-carboxylate (887.5 mg, 2.067 mmol) and K3PO4 (1494 mg, 7.038 mmol), 1,4-dioxane (10.0 mL) was added, followed by water (10.0 mL). The mixture was heated at 100° C. for 3 h. After cooling to room temperature, the reaction mixture was diluted with water (50 mL). AcOH (1313 mg, 21.86 mmol) was added to adjust the pH to 5. The mixture was extracted with EtOAc (3×50 mL). The combined organic layer was washed with brine (100 mL), dried over Na2SO4 and concentrated under reduced pressure. The resulting residue was purified by flash chromatography on silica gel (0-15% MeOH in DCM) to give the sub-title compound as a yellow solid (632.0 mg, 76%). LCMS calc. for C18H14BrN2O4(M+H)+: m/z=401.0. found 401.0.

Workup

additionwas added
temperatureAfter cooling to room temperature
extractionThe mixture was extracted with EtOAc (3×50 mL)
washThe combined organic layer was washed with brine (100 mL)
dry with materialdried over Na2SO4
concentrationconcentrated under reduced pressure
customThe resulting residue was purified by flash chromatography on silica gel (0-15% MeOH in DCM)

Sources & evidence

ORD record: ord-264709d1de0b42dd87912134c050bee7
Source dataset: uspto-grants-2016_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09278950B2

Reaction notes

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