Hydrochloric Acid → 6-Mesityl-1,3,4,7-tetramethyl-2,3-dihydro-1h-pyrazolo[5,1-b]purin-2-one

HRID 890214

反応式

HRID 890214 の反応式
O.NN.[NH2:4][C:5]1[N:10]2[N:11]=[C:12]([CH3:23])[C:13]([C:14]3[C:19]([CH3:20])=[CH:18][C:17]([CH3:21])=[CH:16][C:15]=3[CH3:22])=[C:9]2[N:8]=[C:7]([CH3:24])[C:6]=1C(OCC)=O.Cl.N([O-])=O.[Na+].[H-].[Na+].[CH3:37]I.[CH3:39][N:40](C)[CH:41]=[O:42]>C(O)C.O>[C:15]1([CH3:22])[CH:16]=[C:17]([CH3:21])[CH:18]=[C:19]([CH3:20])[C:14]=1[C:13]1[C:12]([CH3:23])=[N:11][N:10]2[C:5]3[N:4]([CH3:37])[C:41](=[O:42])[N:40]([CH3:39])[C:6]=3[C:7]([CH3:24])=[N:8][C:9]=12

参加物

10

反応物 7

HCID 313Hydrochloric AcidHCID 6228DimethylformamideHCID 6328Methyl iodideHCID 24654Hydrazine hydrate (1:1)HCID 24758Sodium hydrideHCID 22249773Ethyl 7-amino-mesityl-2,5-dimethylpyrazolo[1,5-a]pyrimidin-6-carboxylateHCID 23668193Sodium Nitrite

生成物 1

HCID 222496106-Mesityl-1,3,4,7-tetramethyl-2,3-dihydro-1h-pyrazolo[5,1-b]purin-2-one

試薬・触媒・溶媒 2

HCID 702Ethanol溶媒2 回HCID 962Water溶媒2 回

実験手順

Hydrazine monohydrate (5 mL) was added to a solution of ethyl 7-amino-3-mesityl-2,5-dimethylpyrazolo[1,5-a]pyrimidin-6-carboxylate (809 mg, 2.30 mmol) in ethanol (30 mL), followed by heating under reflux for eight hours. The reaction mixture was evaporated as it was, to give a crude compound. A 10% aqueous solution of hydrogen chloride was added to a solution of the crude compound in ethanol (25 mL) under ice-cooling, and a solution of sodium nitrite (177 mg, 2.53 mmol) in water (10 mL) was gradually added dropwise. After one hour, a temperature was raised to room temperature and the mixture was stirred for 1 five hours. The reaction mixture was evaporated as it was, water was added, and the resulting solid was dried, to give a crude compound (571 mg). Sodium hydride (27 mg, 0.66 mmol) was added to a solution of the crude compound (107 mg, 0.33 mmol) in N,N-dimethylformamide (5 mL) at room temperature. After 30 minutes, methyl iodide (0.052 mL, 0.83 mmol) was added, followed by stirring at the same temperature for one hour. Water was added under ice-cooling, followed by extracting with ether. The organic layer was washed with brine, dried over anhydrous magnesium sulfate and evaporated. The residue was purified by silica gel column chromatography (25% ethyl acetate/hexane), to obtain the title compound (65 mg) as brown crystals.

後処理

  1. temperatureby heating
  2. temperatureunder reflux for eight hours
  3. customThe reaction mixture was evaporated as it
  4. customto give a crude compound
  5. temperaturecooling
  6. customThe reaction mixture was evaporated as it
  7. additionwater was added
  8. customthe resulting solid was dried
  9. customto give a crude compound (571 mg)
  10. waitAfter 30 minutes
  11. stirringby stirring at the same temperature for one hour
  12. temperaturecooling
  13. extractionby extracting with ether
  14. washThe organic layer was washed with brine
  15. dry with materialdried over anhydrous magnesium sulfate
  16. customevaporated
  17. customThe residue was purified by silica gel column chromatography (25% ethyl acetate/hexane)

出典と根拠

ORDレコード
ord-0f84119a474d42c0944c880faebf57bd
出典データセット
uspto-grants-2006_02
特許番号
US06995163B2

関連ノート

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