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Phosphorus oxybromide → 2-(difluoro(5-fluoropyridin-2-yl)methyl)-N-(5-methyl-1H-pyrazol-3-yl)-8-(trifluoromethyl)quinazolin-4-amine

HRID 473181
Notes
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Reaction equation

HRID 473181 reaction equation
[F:1][C:2]([F:25])([C:18]1[CH:23]=[CH:22][C:21]([F:24])=[CH:20][N:19]=1)[C:3]1[N:12]=[C:11](O)[C:10]2[C:5](=[C:6]([C:14]([F:17])([F:16])[F:15])[CH:7]=[CH:8][CH:9]=2)[N:4]=1.P(Br)(Br)(Br)=O.CCN(C(C)C)C(C)C.[CH3:40][C:41]1[NH:45][N:44]=[C:43]([NH2:46])[CH:42]=1>CN(C=O)C.C1(C)C=CC=CC=1>[F:1][C:2]([F:25])([C:18]1[CH:23]=[CH:22][C:21]([F:24])=[CH:20][N:19]=1)[C:3]1[N:12]=[C:11]([NH:46][C:43]2[CH:42]=[C:41]([CH3:40])[NH:45][N:44]=2)[C:10]2[C:5](=[C:6]([C:14]([F:17])([F:16])[F:15])[CH:7]=[CH:8][CH:9]=2)[N:4]=1
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

7

Reactant 4

HCID 24613Phosphorus oxybromideHCID 81531DiisopropylethylamineHCID 931461H-Pyrazol-3-amine, 5-methyl-HCID 178517776HCID 178517776, compound

Product 1

HCID 568486932-(difluoro(5-fluoropyridin-2-yl)methyl)-N-(5-methyl-1H-pyrazol-3-yl)-8-(trifluoromethyl)quinazolin-4-amineYield 20.1%

Reagents, catalysts & solvents

2
HCID 1140TolueneSolventHCID 6228DimethylformamideSolvent

Conditions

Temperature
105 °C

Procedure

To 2-(difluoro(5-fluoropyridin-2-yl)methyl)-8-(trifluoromethyl)quinazolin-4-ol (121 mg, 0.34 mmol) were added phosphoryl tribromide (890 mg) and toluene (1 mL) followed by DIEA (0.117 mL, 0.67 mmol). The mixture was heated at 105° C. for 1 h. The mixture was cooled and partitioned between EtOAc and saturated aq sodium bicarbonate. The organic layer was dried over sodium sulfate and concentrated under reduced pressure. To the residue was added a solution of 5-methyl-1H-pyrazol-3-amine (150 mg, 1.5 mmol) in DMF (4 mL) and the mixture was stirred at rt for 1.5 h. The crude mixture was purified by preparative HPLC (Varian diphenyl reverse phase column, eluting with a gradient of solvent B=0.05% HOAc/ACN and solvent A=0.05% HOAc/H2O) to afford 2-(difluoro(5-fluoropyridin-2-yl)methyl)-N-(5-methyl-1H-pyrazol-3-yl)-8-(trifluoromethyl)quinazolin-4-amine (30 mg, 20%). 1H NMR (300 MHz, DMSO-d6) δ ppm 2.19 (s, 3H) 6.03 (s, 1H) 7.77 (t, J=7.91 Hz, 1H) 7.96-8.06 (m, 2H) 8.27 (d, J=7.53 Hz, 1H) 8.67 (s, 1H) 8.97 (d, J=8.29 Hz, 1H) 11.00 (br s, 1H) 12.18 (br s, 1 H); LC-MS (ESI) m/z 439 (M+H)+.

Workup

  1. temperatureThe mixture was cooled
  2. custompartitioned between EtOAc and saturated aq sodium bicarbonate
  3. dry with materialThe organic layer was dried over sodium sulfate
  4. concentrationconcentrated under reduced pressure
  5. customThe crude mixture was purified by preparative HPLC (Varian diphenyl reverse phase column
  6. washeluting with a gradient of solvent B=0.05% HOAc/ACN and solvent A=0.05% HOAc/H2O)

Sources & evidence

ORD record
ord-6288a71a4e9046a882a08dc8484cef54
Source dataset
uspto-grants-2014_01
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08633207B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes