Water → 7-Chloro-2-(4-methoxyphenyl)pyrazolo[1,5-A]pyridine

HRID 8499

反応式

HRID 8499 の反応式
[Cl:1][C:2]1[N:7]=[C:6]([CH2:8][C:9]([C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=2OC)=[N:10]O)[CH:5]=[CH:4][CH:3]=1.FC(F)(F)[C:22](OC(=O)C(F)(F)F)=[O:23].C(N(CC)CC)C.O>COCCOC.[Fe](Cl)Cl>[Cl:1][C:2]1[N:7]2[N:10]=[C:9]([C:12]3[CH:13]=[CH:14][C:15]([O:23][CH3:22])=[CH:16][CH:17]=3)[CH:8]=[C:6]2[CH:5]=[CH:4][CH:3]=1

参加物

7

反応物 4

HCID 962WaterHCID 8471TriethylamineHCID 9845Trifluoroacetic anhydrideHCID 738583212-(6-Chloro-2-pyridinyl)-1-(methoxyphenyl)ethanone oxime

生成物 1

HCID 223500457-Chloro-2-(4-methoxyphenyl)pyrazolo[1,5-A]pyridine収率 52%

試薬・触媒・溶媒 2

HCID 24458Ferrous Chloride触媒HCID 80711,2-Dimethoxyethane溶媒2 回

反応条件

温度
15 °C

実験手順

To a solution of 2-(6-chloro-2-pyridinyl)-1-(methoxyphenyl)ethanone oxime (38.7 g, 140 mmol) in 1,2-dimethoxyethane (156 mL) at 0° C. was added trifluoroacetic anhydride (20 mL, 140 mmol), keeping the temperature below 10° C. during the addition. After the addition was complete, the reaction was warmed to 15° C. The solution was then cooled to 4° C. and a solution of triethylamine (39 mL, 280 mmol) in 1,2-dimethoxyethane (15 mL) was added over a period of 0.5 hours. The mixture was allowed to warm to room temperature and was stirred at room temperature for 1.5 hours. To this mixture was added iron(II) chloride (0.18 g, 1.4 mmol) and the reaction was heated at 75° C. for 15 hours. The reaction mixture was poured into water (300 mL). The resulting suspension was extracted with ethyl acetate. The organic phase was dried (magnesium sulfate), filtered and concentrated to a solid. This solid was recrystallized from methanol to give 7-chloro-2-(4-methoxyphenyl)pyrazolo[1,5-α]pyridine (18.7 g, 52%) as pale yellow needles. 1H NMR (CDCl3): δ 7.91 (d, 2H), 7.43 (d, 1H), 7.01 (t,1H), 6.95 (d, 2H). 6.81 (d,1 1H), 6.80 (s, 1H), 3.83 (s, 3 H); MS m/z 259 (M+1).

後処理

  1. customthe temperature below 10° C.
  2. additionduring the addition
  3. additionAfter the addition
  4. temperatureThe solution was then cooled to 4° C.
  5. temperatureto warm to room temperature
  6. temperaturethe reaction was heated at 75° C. for 15 hours
  7. extractionThe resulting suspension was extracted with ethyl acetate
  8. dry with materialThe organic phase was dried (magnesium sulfate)
  9. filtrationfiltered
  10. concentrationconcentrated to a solid
  11. customThis solid was recrystallized from methanol

出典と根拠

ORDレコード
ord-0ac1125695fe41e882e014c7fc9b3c1c
出典データセット
uspto-grants-2006_08
特許番号
US07087618B2

関連ノート

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