Pyridine → Ethyl N-(6,7-dichloro-2-methoxyquinoxalin-3-yl)carbamate

HRID 1878283

反応式

HRID 1878283 の反応式
[NH2:1][C:2]1[C:11]([O:12][CH3:13])=[N:10][C:9]2[C:4](=[CH:5][C:6]([Cl:15])=[C:7]([Cl:14])[CH:8]=2)[N:3]=1.Cl[C:17]([O:19][CH2:20][CH3:21])=[O:18].N1C=CC=CC=1>ClCCl>[Cl:15][C:6]1[CH:5]=[C:4]2[C:9](=[CH:8][C:7]=1[Cl:14])[N:10]=[C:11]([O:12][CH3:13])[C:2]([NH:1][C:17](=[O:18])[O:19][CH2:20][CH3:21])=[N:3]2

参加物

5

反応物 3

HCID 1049PyridineHCID 10928Ethyl chloroformateHCID 692433492-Amino-6,7-dichloro-3-methoxyquinoxaline

生成物 1

HCID 69243293Ethyl N-(6,7-dichloro-2-methoxyquinoxalin-3-yl)carbamate収率 86%

試薬・触媒・溶媒 1

HCID 6344Dichloromethane溶媒

実験手順

2-Amino-6,7-dichloro-3-methoxyquinoxaline (1.16 g, 4.75 mmol) and ethyl chloroformate (1.03 g, 9.50 mmol) were dissolved in dichloromethane (50 ml) at room temperature and thereto pyridine (751 mg, 9.50 mmol) was added. The mixture was stirred at room temperature for 24 hours and concentrated under the reduced pressure to remove the solvent, and purified by SiO2 column chromatography. Extraction of the residue with a n-hexane:ethyl acetate (2:1) mixture and concentration gave 1.29 g of the titled compound (yield, 86%).

後処理

  1. concentrationconcentrated under the reduced pressure
  2. customto remove the solvent
  3. custompurified by SiO2 column chromatography
  4. extractionExtraction of the residue
  5. concentrationwith a n-hexane:ethyl acetate (2:1) mixture and concentration

出典と根拠

ORDレコード
ord-882ee2faa6a347c5b2f867c1bbfcd2cb
出典データセット
uspto-grants-2012_11
特許番号
US08314100B2

関連ノート

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