Nitric Acid → 4-(5-Nitro-thiophen-2-yl)-butyric acid methyl ester

HRID 1178617

反応式

HRID 1178617 の反応式
[N+:1]([O-:4])(O)=[O:2].[CH3:5][O:6][C:7](=[O:16])[CH2:8][CH2:9][CH2:10][C:11]1[S:12][CH:13]=[CH:14][CH:15]=1>C(OC(=O)C)(=O)C>[CH3:5][O:6][C:7](=[O:16])[CH2:8][CH2:9][CH2:10][C:11]1[S:12][C:13]([N+:1]([O-:4])=[O:2])=[CH:14][CH:15]=1

参加物

4

反応物 2

HCID 944Nitric AcidHCID 1407664-(2-Thienyl)butanoic acid methyl ester

生成物 1

HCID 692334004-(5-Nitro-thiophen-2-yl)-butyric acid methyl ester

試薬・触媒・溶媒 1

HCID 7918Acetic Anhydride溶媒2 回

実験手順

To 8 mL of acetic anhydride at −20° C. is added 1.2 mL of nitric acid (d=1.5). The mixture is kept at −20° C., and a solution of 4-thiophen-2-yl-butyric acid methyl ester (1.84 g, 10.0 mmol) in 12 mL of acetic anhydride is added dropwise. The reaction mixture is stirred for 10 minutes after completion of addition, and poured into an ice-water mixture. The product is extracted with ethyl acetate and the organic layer is washed with 10 N aqueous sodium hydroxide solution, dried and concentrated. The residue is purified by flash column chromatography eluting with 1:4 ethyl acetate:hexane to provide 1.32 g of 4-(5-nitro-thiophen-2-yl)-butyric acid methyl ester as a yellow oil; 1H NMR (DMSO-d6) δ 1.93 (quintet, J=7 Hz, 2H), 2.41 (t, J=7 Hz, 2H), 2.88 (t, J=7 Hz, 2H), 3.59 (s, 3H), 7.04 (d, J=5 Hz, 1H), 8.01 (d, J=5 Hz, 1H); MS 229.0 (M)+

後処理

  1. customis kept at −20° C.
  2. additionafter completion of addition
  3. extractionThe product is extracted with ethyl acetate
  4. washthe organic layer is washed with 10 N aqueous sodium hydroxide solution
  5. customdried
  6. concentrationconcentrated
  7. customThe residue is purified by flash column chromatography
  8. washeluting with 1:4 ethyl acetate

出典と根拠

ORDレコード
ord-ce786d9bf66a402ab74423ada59df1fb
出典データセット
uspto-grants-2007_10
特許番号
US07276519B2

関連ノート

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