Cesium carbonate → 5-Bromo-3-(imidazo[1,2-a]pyridin-7-ylamino)-1-methylpyrazin-2(1H)-one

HRID 1021838ノート

反応式

HRID 1021838 の反応式
[N:1]1[CH:2]=[CH:3][N:4]2[CH:9]=[CH:8][C:7]([NH2:10])=[CH:6][C:5]=12.C([O-])([O-])=O.[Cs+].[Cs+].Br[C:18]1[C:19](=[O:26])[N:20]([CH3:25])[CH:21]=[C:22]([Br:24])[N:23]=1.CC1(C)C2C(=C(P(C3C=CC=CC=3)C3C=CC=CC=3)C=CC=2)OC2C(P(C3C=CC=CC=3)C3C=CC=CC=3)=CC=CC1=2>C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd].O1CCOCC1>[Br:24][C:22]1[N:23]=[C:18]([NH:10][C:7]2[CH:8]=[CH:9][N:4]3[CH:3]=[CH:2][N:1]=[C:5]3[CH:6]=2)[C:19](=[O:26])[N:20]([CH3:25])[CH:21]=1

参加物

7

反応物 4

HCID 10796Cesium carbonateHCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)HCID 130629693,5-Dibromo-1-methyl-1H-pyrazin-2-oneHCID 45087541Imidazo[1,2-a]pyridin-7-amine

生成物 1

HCID 866843315-Bromo-3-(imidazo[1,2-a]pyridin-7-ylamino)-1-methylpyrazin-2(1H)-one収率 44%

試薬・触媒・溶媒 2

HCID 9811564Bis(dibenzylideneacetone)palladium触媒HCID 312751,4-Dioxane溶媒

反応条件

温度
100 °C

実験手順

A 100-mL round-bottomed flask equipped with a reflux condenser was charged with imidazo[1,2-a]pyridin-7-amine (665 mg, 5.0 mmol), Cs2CO3 (3.26 g, 10 mmol), 3,5-dibromo-1-methylpyrazin-2(1H)-one (1.86 g, 7.0 mmol), Xantphos (289 mg, 0.50 mmol), Pd2(dba)3 (458 mg, 0.50 mmol), and 1,4-dioxane (30 mL). After bubbling nitrogen through the mixture for 30 minutes, it was heated at 100° C. under nitrogen atmosphere for 16 h. Analysis of the reaction mixture by LCMS showed little starting material remained. The reaction mixture was cooled to room temperature and filtered. The filtrate was diluted with dichloromethane (60 mL) and water (50 mL). The aqueous layer was separated and extracted with dichloromethane (3×20 mL). The combined organic layers was dried over Na2SO4, filtered, and concentrated under reduced pressure. The dark residue was purified by silica-gel column chromatography eluting with dichloromethane/methanol (60/1 to 30/1) to afford 185a (700 mg, 44%) as a light yellow solid. MS-ESI: [M+H]+ 320

後処理

  1. customA 100-mL round-bottomed flask equipped with a reflux condenser
  2. customAfter bubbling nitrogen through the mixture for 30 minutes
  3. temperatureThe reaction mixture was cooled to room temperature
  4. filtrationfiltered
  5. additionThe filtrate was diluted with dichloromethane (60 mL) and water (50 mL)
  6. customThe aqueous layer was separated
  7. extractionextracted with dichloromethane (3×20 mL)
  8. dry with materialThe combined organic layers was dried over Na2SO4
  9. filtrationfiltered
  10. concentrationconcentrated under reduced pressure
  11. customThe dark residue was purified by silica-gel column chromatography
  12. washeluting with dichloromethane/methanol (60/1 to 30/1)

出典と根拠

ORDレコード
ord-e6e3c927576c401f8fb171af154cf4f8
出典データセット
uspto-grants-2014_05
特許番号
US08716274B2

反応ノート

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