Phosphorus oxybromide → 4-Bromo-2-(2,6-dichloro-4-vinylphenyl)-7-fluoro-2H-pyrazolo[4,3-c]pyridine

HRID 626804ノート

反応式

HRID 626804 の反応式
[Cl:1][C:2]1[CH:7]=[C:6]([CH:8]=[CH2:9])[CH:5]=[C:4]([Cl:10])[C:3]=1[N:11]1[CH:21]=[C:14]2[CH:15]=[N+:16]([O-])[CH:17]=[C:18]([F:19])[C:13]2=[N:12]1.P(Br)(Br)([Br:24])=O>C(Cl)Cl>[Br:24][C:15]1[C:14]2=[CH:21][N:11]([C:3]3[C:2]([Cl:1])=[CH:7][C:6]([CH:8]=[CH2:9])=[CH:5][C:4]=3[Cl:10])[N:12]=[C:13]2[C:18]([F:19])=[CH:17][N:16]=1

参加物

4

反応物 2

HCID 24613Phosphorus oxybromideHCID 677008712-(2,6-Dichloro-4-vinylphenyl)-7-fluoro-2H-pyrazolo[4,3-c]pyridine 5 oxide

生成物 1

HCID 866970824-Bromo-2-(2,6-dichloro-4-vinylphenyl)-7-fluoro-2H-pyrazolo[4,3-c]pyridine収率 25.3%

試薬・触媒・溶媒 1

HCID 6344Dichloromethane溶媒

反応条件

温度
0 °C

実験手順

To a suspension of 2-(2,6-dichloro-4-vinylphenyl)-7-fluoro-2H-pyrazolo[4,3-c]pyridine 5 oxide (1.0 g, 3.1 mmol) in DCM (15 mL) under an atmosphere of nitrogen at 0° C., was added phosphorus oxybromide (2.6 g, 9.0 mmol). The reaction mixture was stirred at 0° C. for 1 hour and then allowed to reach room temperature over 30 minutes. The resultant mixture was quenched with saturated aqueous sodium hydrogen carbonate solution and diluted with DCM. The layers were separated and the organic layer was washed with brine, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified by silica gel flash chromatography (20% ethyl acetate in cyclohexane) to afford the title compound as a white solid (304 mg, 25% yield). 1H NMR (400 MHz, DMSO-d6): δ 9.41 (d, J=2.5 Hz, 1H), 8.19 (d, J=3.3 Hz, 1H), 7.99 (s, 2H), 6.85 (dd, J=17.6, 11.0 Hz, 1H), 6.25 (d, J=17.6 Hz, 1H), 5.60 (d, J=11.0 Hz, 1H).

後処理

  1. waitto reach room temperature over 30 minutes
  2. customThe resultant mixture was quenched with saturated aqueous sodium hydrogen carbonate solution
  3. additiondiluted with DCM
  4. customThe layers were separated
  5. washthe organic layer was washed with brine
  6. dry with materialdried over anhydrous sodium sulfate
  7. filtrationfiltered
  8. concentrationconcentrated under reduced pressure
  9. customThe residue was purified by silica gel flash chromatography (20% ethyl acetate in cyclohexane)

出典と根拠

ORDレコード
ord-fbfdedd603bc4cd3b96cc0125ab29101
出典データセット
uspto-grants-2016_04
特許番号
US09309240B2

反応ノート

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