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

HRID 1907645ノート

反応式

HRID 1907645 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]([O:16][CH3:17])=[C:7]([O:14][CH3:15])[CH:8]=2)[N:3]=1.Cl[C:19]([O:21][CH2:22][CH3:23])=[O:20].N1C=CC=CC=1>ClCCl>[CH3:13][O:12][C:11]1[C:2]([NH:1][C:19](=[O:20])[O:21][CH2:22][CH3:23])=[N:3][C:4]2[C:9](=[CH:8][C:7]([O:14][CH3:15])=[C:6]([O:16][CH3:17])[CH:5]=2)[N:10]=1

参加物

5

反応物 3

HCID 1049PyridineHCID 10928Ethyl chloroformateHCID 692443442-Amino-3,6,7-trimethoxyquinoxaline

生成物 1

HCID 69244380Ethyl N-(2,6,7-trimethoxyquinoxalin-3-yl)carbamate収率 90%

試薬・触媒・溶媒 1

HCID 6344Dichloromethane溶媒

実験手順

2-Amino-3,6,7-trimethoxyquinoxaline (2.60 g, 11.0 mmol) and ethyl chloroformate (2.40 g, 22.1 mmol) were dissolved in dichloromethane (50 ml) at room temperature and thereto pyridine (1.75 g, 22.1 mmol) was added. The mixture was stirred at room temperature for 22 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 3.04 g of the titled compound (yield, 90%).

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-21e797b1369c49b9892fe2f848fd0e01
出典データセット
uspto-grants-2013_12
特許番号
US08598173B2

反応ノート

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