2,3,4-Trimethoxybenzoic acid → 5-Bromo-2,3,4-trimethoxybenzoic acid

HRID 502770

반응식

HRID 502770 반응식
[CH3:1][O:2][C:3]1[C:11]([O:12][CH3:13])=[C:10]([O:14][CH3:15])[CH:9]=[CH:8][C:4]=1[C:5]([OH:7])=[O:6].CC([O-])=O.[Na+].[Br:21]Br>CC(O)=O.C(OCC)C>[Br:21][C:9]1[C:10]([O:14][CH3:15])=[C:11]([O:12][CH3:13])[C:3]([O:2][CH3:1])=[C:4]([CH:8]=1)[C:5]([OH:7])=[O:6]

참가 물질

6

반응물 3

HCID 113082,3,4-Trimethoxybenzoic acidHCID 24408BromineHCID 517045Sodium Acetate

생성물 1

HCID 594278855-Bromo-2,3,4-trimethoxybenzoic acid

시약·촉매·용매 2

HCID 176Acetic Acid용매2회HCID 3283Diethyl Ether용매

반응 조건

온도
80 °C

실험 절차

To a solution of 2,3,4-trimethoxybenzoic acid (4.7 g, 22 mmol) and NaOAc (5.5 g, 40 mmol) in 35 ml AcOH was added a solution of bromine (1.5 ml, 29 mmol) in 35 ml AcOH. The reaction became red in color, which quickly faded. The mixture was heated to 80° C. for 1 h, at which point it was cooled to ambient temperature. The material was partitioned between dichloromethane and water. The organic layer was removed and the aqueous layer was extracted once with dichloromethane. The combined organic layers were dried with Na2SO4, filtered, and concentrated to give an oil which solidified on standing. The material was dissolved in diethyl ether and hexanes. Concentration to ½ the volume resulted in precipitation of a white solid. Filtration provided the title compound as a white solid. MS m/z: 293 (M+H+); calc'd for C10H11BrO5: 291.1

후처리

  1. temperaturewas cooled to ambient temperature
  2. customThe material was partitioned between dichloromethane and water
  3. customThe organic layer was removed
  4. extractionthe aqueous layer was extracted once with dichloromethane
  5. dry with materialThe combined organic layers were dried with Na2SO4
  6. filtrationfiltered
  7. concentrationconcentrated
  8. customto give an oil which
  9. concentrationConcentration
  10. customresulted in precipitation of a white solid
  11. filtrationFiltration

출처 및 근거

ORD 기록
ord-cdacedadcb22463faf9b0c619e09fb73
출처 데이터셋
uspto-grants-2010_08
특허 번호
US07776869B2

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