Acetic Acid → 5-Chloro-2,7-dimethyl-1H-imidazo[4,5-b]pyridine

HRID 1890623ノート

反応式

HRID 1890623 の反応式
[NH2:1][C:2]1[C:7]([N+:8]([O-])=O)=[C:6]([CH3:11])[CH:5]=[C:4]([Cl:12])[N:3]=1.O.O.[Sn](Cl)Cl.[OH-].[Na+].[C:20](O)(=O)[CH3:21].C(=O)([O-])[O-].[Na+].[Na+].N>C(O)C.C(OCC)(=O)C>[Cl:12][C:4]1[N:3]=[C:2]2[N:1]=[C:20]([CH3:21])[NH:8][C:7]2=[C:6]([CH3:11])[CH:5]=1

参加物

9

反応物 6

HCID 176Acetic AcidHCID 222AmmoniaHCID 10340Sodium CarbonateHCID 14798Sodium HydroxideHCID 61436Stannous chloride dihydrateHCID 707010046-Chloro-4-methyl-3-nitropyridin-2-amine

生成物 1

HCID 223884515-Chloro-2,7-dimethyl-1H-imidazo[4,5-b]pyridine

試薬・触媒・溶媒 2

HCID 702Ethanol溶媒HCID 8857Ethyl Acetate溶媒

反応条件

温度
75 °C

実験手順

2-Amino-6-chloro-4-methyl-3-nitropiridine (1.2 g, 6.40 mmol) synthesized according to the method described in WO98/02442 was dissolved in ethanol (65 mL), and tin(II) chloride dihydrate (4.33 g, 19.2 mmol) was added, followed by stirring at 75° C. for 2 hours. The reaction mixture was diluted with ethyl acetate and was added with 3 mol/L aqueous sodium hydroxide solution. The unsoluble material was filtered out through Celite, and washed with ethyl acetate. The filtrate was sequentially washed with water, saturated brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. Next, polyphosphoric acid (15.3 g) and acetic acid (1.72 mL, 30.0 mmol) was added to the residue, and was stirred for 80° C. for 3 hours. The reaction mixture was moved to ice water and sodium carbonate (11.4 g, 0.108 mol) was added in a little portion while stirring. Then, 28% aqueous ammonia solution was added to the residue to control the pH to 9 and the mixture was stirred for 1 hour. Precipitated crude crystals were collected by filtration, and were washed with water, and the obtained crystals were dried in vacuo at 40° C. overnight to obtain Compound P38 (395 mg, 34%).

後処理

  1. filtrationThe unsoluble material was filtered out through Celite
  2. washwashed with ethyl acetate
  3. washThe filtrate was sequentially washed with water, saturated brine
  4. dry with materialdried over anhydrous magnesium sulfate
  5. concentrationconcentrated under reduced pressure
  6. stirringwas stirred for 80° C. for 3 hours
  7. additionwas added in a little portion
  8. stirringwhile stirring
  9. stirringthe mixture was stirred for 1 hour
  10. customPrecipitated crude crystals
  11. filtrationwere collected by filtration
  12. washwere washed with water
  13. customthe obtained crystals were dried in vacuo at 40° C. overnight
  14. customto obtain Compound P38 (395 mg, 34%)

出典と根拠

ORDレコード
ord-353b4a496194476d972460b8ccd840dd
出典データセット
uspto-grants-2013_08
特許番号
US08507484B2

反応ノート

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