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Cesium carbonate → 3-(2-(4-Fluorophenyl)furo[2,3-b]pyridin-5-yl)benzoic acid

HRID 44054
Notes
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Reaction equation

HRID 44054 reaction equation
[C:1]([C:4]1[CH:5]=[C:6](B(O)O)[CH:7]=[CH:8][CH:9]=1)([OH:3])=[O:2].Br[C:14]1[CH:15]=[C:16]2[CH:22]=[C:21]([C:23]3[CH:28]=[CH:27][C:26]([F:29])=[CH:25][CH:24]=3)[O:20][C:17]2=[N:18][CH:19]=1.C([O-])([O-])=O.[Cs+].[Cs+]>O1CCOCC1.O.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[F:29][C:26]1[CH:25]=[CH:24][C:23]([C:21]2[O:20][C:17]3=[N:18][CH:19]=[C:14]([C:6]4[CH:5]=[C:4]([CH:9]=[CH:8][CH:7]=4)[C:1]([OH:3])=[O:2])[CH:15]=[C:16]3[CH:22]=2)=[CH:28][CH:27]=1
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

7

Reactant 3

HCID 10796Cesium carbonateHCID 27339573-Carboxyphenylboronic acidHCID 592337145-Bromo-2-(4-fluorophenyl)furo[2,3-b]pyridine

Product 1

HCID 592337413-(2-(4-Fluorophenyl)furo[2,3-b]pyridin-5-yl)benzoic acidYield 30%

Reagents, catalysts & solvents 3

HCID 178418397
HCID 178418397, compound
Catalyst
HCID 962WaterSolvent
HCID 312751,4-DioxaneSolvent

Conditions

Temperature
95 °C

Procedure

3-Carboxyphenylboronic acid (700 mg, 4.22 mmol), 5-bromo-2-(4-fluorophenyl)furo[2,3-b]pyridine (750 mg, 2.57 mmol), Pd(Ph3P)4 (30 mg, 0.026 mmol), and Cs2CO3 (1.25 g, 3.84 mmol) were combined in dioxane (20 mL) and water (4 mL). The mixture was evacuated/backfilled with nitrogen (3×). The reaction was heated to 95° C. under N2 (g) overnight. The mixture was partitioned between EtOAc and 1N HCl. The organic phase was washed with water and brine, dried over MgSO4, filtered, and concentrated to give a brown solid which was triturated with Et2O to give the expected product 3-(2-(4-fluorophenyl)furo[2,3-b]pyridin-5-yl)benzoic acid (255 mg, 30% yield) consistent by LCMS. LC-MS retention time: 1.83 min; m/z (MH+): 334. LC data was recorded on a Shimadzu LC-10AS liquid chromatograph equipped with a Phenomenex-Luna 10u C18 3.0×50 mm column using a SPD-10AV UV-Vis detector at a detector wave length of 220 nM. The elution conditions employed a flow rate of 5 ml/min, a gradient of 100% solvent A/0% solvent B to 0% solvent A/100% solvent B, a gradient time of 2 min, a hold time of 1 min, and an analysis time of 3 min where solvent A was 10% MeOH/90% H2O/0.1% trifluoroacetic acid and solvent B was 10% H2O/90% MeOH/0.1% trifluoroacetic acid. MS data was determined using a Micromass Platform for LC in electrospray mode.

Workup

  1. customThe mixture was partitioned between EtOAc and 1N HCl
  2. washThe organic phase was washed with water and brine
  3. dry with materialdried over MgSO4
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customto give a brown solid which
  7. customwas triturated with Et2O

Sources & evidence

ORD record
ord-7b42b575f7144d3c9ae517819e88da8a
Source dataset
uspto-grants-2013_09
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08536338B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes