N-bromobutanimide → Methyl 4-(bromomethyl)-2-hydroxybenzoate

HRID 362576노트

반응식

HRID 362576 반응식
[CH3:1][C:2]1[CH:3]=[C:4]([OH:12])[C:5](=[CH:10][CH:11]=1)[C:6]([O:8][CH3:9])=[O:7].[Br:13]N1C(=O)CCC1=O>C(Cl)(Cl)(Cl)Cl.C(OOC(=O)C1C=CC=CC=1)(=O)C1C=CC=CC=1.BrN1C(=O)CCC1=O>[Br:13][CH2:1][C:2]1[CH:3]=[C:4]([OH:12])[C:5](=[CH:10][CH:11]=1)[C:6]([O:8][CH3:9])=[O:7]

참가 물질

6

반응물 2

HCID 67184N-bromobutanimideHCID 78400Benzoic acid, 2-hydroxy-4-methyl-, methyl ester

생성물 1

HCID 22556059Methyl 4-(bromomethyl)-2-hydroxybenzoate수율 58%

시약·촉매·용매 3

HCID 7187Benzoyl Peroxide촉매HCID 67184N-bromobutanimide촉매HCID 5943Carbon Tetrachloride용매

실험 절차

Methyl 4-methylsalicylate (98.1 g, 590 mmoles) was dissolved in carbon tetrachloride (600 mL), and N-bromosuccinimide (105.0 I, 590 mmoles) and benzoyl peroxide (0.7 g, 3 mmoles) were added. The mixture was refluxed under nitrogen. After 2 hours, an additional portion (0.7 g) of N-bromosuccinimide was added. Reflux was continued for 16 hours. The reaction mixture was cooled to room temperature and the solid removed by filtration: The yellow filtrate was evaporated to dryness to afford a thick yellow syrup that solidified on standing. Hexanes (500 mL) was added to the solid, and the mixture was boiled until almost all solids dissolved. The hot hexanes solution was filtered and concentrated until a solid just began to precipitate. The mixture was heated to dissolve the solid, and the solution was allowed to cool slowly to room temperature. Pale yellow crystals formed slowly. The mixture was then chilled in ice for 2 hours to complete crystallization. Finally, the solid was filtered, washed with cold hexanes (100 mL), and dried in vacuo to afford 83.5 g (58% yield) of methyl 4bromomethylsalicylate (m.p. 73°-750 C., open capillary, uncorrected).

후처리

  1. temperatureThe mixture was refluxed under nitrogen
  2. temperatureReflux
  3. waitwas continued for 16 hours
  4. customthe solid removed by filtration
  5. customThe yellow filtrate was evaporated to dryness
  6. customto afford a thick yellow syrup that solidified
  7. dissolutiondissolved
  8. filtrationThe hot hexanes solution was filtered
  9. concentrationconcentrated until a solid
  10. customto precipitate
  11. temperatureThe mixture was heated
  12. dissolutionto dissolve the solid
  13. temperatureto cool slowly to room temperature
  14. customPale yellow crystals formed slowly
  15. temperatureThe mixture was then chilled in ice for 2 hours
  16. customcrystallization
  17. filtrationFinally, the solid was filtered
  18. washwashed with cold hexanes (100 mL)
  19. customdried in vacuo

출처 및 근거

ORD 기록
ord-ccbe9aae2aca47e3adb875692089fa65
출처 데이터셋
uspto-grants-1999_02
특허 번호
US05869623

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