5-Methylpyrazin-2-amine → N,N-dimethyl-5-(2-methyl-6-((5-methylpyrazin-2-yl)carbamoyl)benzofuran-4-yloxy)pyrazine-2-carboxamide

HRID 1027707ノート

反応式

HRID 1027707 の反応式
[CH3:1][C:2]1[N:3]=[CH:4][C:5]([NH2:8])=[N:6][CH:7]=1.[Cl-].C[Al+]C.[CH3:13][N:14]([CH3:39])[C:15]([C:17]1[N:18]=[CH:19][C:20]([O:23][C:24]2[C:29]3[CH:30]=[C:31]([CH3:33])[O:32][C:28]=3[CH:27]=[C:26]([C:34](OCC)=[O:35])[CH:25]=2)=[N:21][CH:22]=1)=[O:16]>COC>[CH3:39][N:14]([CH3:13])[C:15]([C:17]1[CH:22]=[N:21][C:20]([O:23][C:24]2[C:29]3[CH:30]=[C:31]([CH3:33])[O:32][C:28]=3[CH:27]=[C:26]([C:34](=[O:35])[NH:8][C:5]3[CH:4]=[N:3][C:2]([CH3:1])=[CH:7][N:6]=3)[CH:25]=2)=[CH:19][N:18]=1)=[O:16]

参加物

5

反応物 3

HCID 3132155-Methylpyrazin-2-amineHCID 16686359Dimethylalumanylium chlorideHCID 59483311Ethyl 4-(5-(dimethylcarbamoyl)pyrazin-2-yloxy)-2-methylbenzofuran-6-carboxylate

生成物 1

HCID 46916741N,N-dimethyl-5-(2-methyl-6-((5-methylpyrazin-2-yl)carbamoyl)benzofuran-4-yloxy)pyrazine-2-carboxamide収率 72%

試薬・触媒・溶媒 1

HCID 8254Dimethyl Ether溶媒2 回

反応条件

温度
0 °C

実験手順

5-methyl-2-aminopyrazine (6.8 g, 63 mmol) was taken up in 70 mL of dimethylether and cooled to 0° C. Dimethyaluminium chloride (131 mmol, 1 M in hexane) was added dropwise. The resulting mixture was warmed up to ambient temperature and stirred for 30 min. Ethyl 4-(5-(dimethylcarbamoyl)pyrazin-2-yloxy)-2-methylbenzofuran-6-carboxylate (I-1d: 10.1 g, 27.3 mmol) in dimethylether (70 mL) was then added to the activated amine solution via canula. The combined solution was heated to reflux overnight. The reaction was cooled on ice and slowly quenched by the dropwise addition of aqueous Rochelle's salt (concentrated, 100 mL). The mixture was stirred for 20 minutes. The mixture was separated. Organic layer was washed with aqueous Rochelle's salt (30 ml), 1N HCl (30 ml), brine (30 ml), dried over sodium sulfate, and concentrated in vacuo. The crude product was purified by column chromatography (silica gel, gradient of ethyl acetate from 50-100% in heptane) to give desired N,N-dimethyl-5-(2-methyl-6-((5-methylpyrazin-2-yl)carbamoyl)benzofuran-4-yloxy)pyrazine-2-carboxamide (1: 8.5 gram 72%).

後処理

  1. temperatureThe resulting mixture was warmed up to ambient temperature
  2. temperatureThe combined solution was heated
  3. temperatureto reflux overnight
  4. temperatureThe reaction was cooled on ice
  5. customslowly quenched by the dropwise addition of aqueous Rochelle's salt (concentrated, 100 mL)
  6. stirringThe mixture was stirred for 20 minutes
  7. customThe mixture was separated
  8. washOrganic layer was washed with aqueous Rochelle's salt (30 ml), 1N HCl (30 ml), brine (30 ml)
  9. dry with materialdried over sodium sulfate
  10. concentrationconcentrated in vacuo
  11. customThe crude product was purified by column chromatography (silica gel, gradient of ethyl acetate from 50-100% in heptane)

出典と根拠

ORDレコード
ord-95d1c7ae385a4911b54d65aa54590f53
出典データセット
uspto-grants-2014_05
特許番号
US08735396B2

反応ノート

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