2,4-Dichlorophenyl isocyanate → 3-(2,4-Dichlorophenyl)-6-fluoroquinazoline-2,4(1H,3H)-dione

HRID 1735969ノート

反応式

HRID 1735969 の反応式
[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[N:9]=[C:10]=[O:11].[F:12][C:13]1[CH:23]=[C:17]([C:18](OCC)=[O:19])[C:16]([NH2:24])=[CH:15][CH:14]=1.C[O-].[Na+]>CN1CCCC1=O>[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[N:9]1[C:18](=[O:19])[C:17]2[C:16](=[CH:15][CH:14]=[C:13]([F:12])[CH:23]=2)[NH:24][C:10]1=[O:11]

参加物

5

反応物 3

HCID 757892,4-Dichlorophenyl isocyanateHCID 10942334Sodium MethoxideHCID 11126923Ethyl 2-amino-5-fluorobenzoate

生成物 1

HCID 40212773-(2,4-Dichlorophenyl)-6-fluoroquinazoline-2,4(1H,3H)-dione収率 91.7%

試薬・触媒・溶媒 1

HCID 13387N-methyl-2-pyrrolidone溶媒2 回

反応条件

温度
90 °C

実験手順

A solution of 2,4-dichlorophenyl isocyanate (18.8 g, 0.10 mol) in N-methylpyrrolidone (50 ml) is metered at room temperature into a solution of ethyl 5-fluoroanthranilate (18.3 g, 0.10 mol) in N-methylpyrrolidone (70 ml). After addition is complete, the mixture is stirred at 90° C. for 2 hours. 1.80 ml of a 30% strength solution of methanolic sodium methoxide (0.010 mol) are metered in and the mixture is stirred under reflux for a further 2 hours, ethanol and methanol being distilled off. After cooling, the product is precipitated by addition of dilute hydrochloric acid (100 ml). The product is then filtered off with suction, washed with water and dried. 29.8 g of 3-(2,4-dichlorophenyl)-6-fluoro-2,4(1H,3H)-quinazolinedione (yield: 91.7% of theory) of melting point 311° to 313° C. are obtained.

後処理

  1. additionAfter addition
  2. stirringis stirred
  3. temperatureunder reflux for a further 2 hours
  4. distillationethanol and methanol being distilled off
  5. temperatureAfter cooling
  6. customthe product is precipitated by addition of dilute hydrochloric acid (100 ml)
  7. filtrationThe product is then filtered off with suction
  8. washwashed with water
  9. customdried

出典と根拠

ORDレコード
ord-5ccbc9feb3244fffa980c2b49e62b9cc
出典データセット
uspto-grants-1996_07
特許番号
US05539114

反応ノート

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