Methyl 3,4-Dimethoxybenzoate → Methyl 2-bromo-4,5-dimethoxybenzoate

HRID 522541

반응식

HRID 522541 반응식
[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:10]=[CH:11][C:12]=1[O:13][CH3:14])[C:6]([O:8][CH3:9])=[O:7].[Br:15]Br>CC(O)=O>[CH3:9][O:8][C:6](=[O:7])[C:5]1[CH:4]=[C:3]([O:2][CH3:1])[C:12]([O:13][CH3:14])=[CH:11][C:10]=1[Br:15]

참가 물질

4

반응물 2

HCID 16522Methyl 3,4-DimethoxybenzoateHCID 24408Bromine

생성물 1

HCID 2817399Methyl 2-bromo-4,5-dimethoxybenzoate수율 64%

시약·촉매·용매 1

HCID 176Acetic Acid용매2회

실험 절차

To 10.00 g (51 mmol) of methyl 3,4 dimethoxybenzoate (6) in 50 mL of AcOH at 0° C. was added 8.90 g (56 mmol) of Br2 in 50 mL of AcOH over 1.5 h. The ice bath was removed and the mixture stirred 45 min. The reaction was quenched by pouring into 700 mL of H2O, stirred 30 min, left quiescent for 1 h, and filtered. The collected solid was washed with H2O and washed with sat. aq. Na2S2O3. The solid was partially dried, dissolved in 300 mL hot MeOH, and the resultant solution was cooled. The cool methanolic solution of product was treated with 200 mL of H2O and the white solid filtered to give 8.92 g (64% yield) of methyl-2-bromo-4,5-dimethoxybenzoate (7) as a white powder. The compound matched the physical and spectral properties of the known compound.

후처리

  1. customThe ice bath was removed
  2. customThe reaction was quenched
  3. additionby pouring into 700 mL of H2O
  4. stirringstirred 30 min
  5. waitleft quiescent for 1 h
  6. filtrationfiltered
  7. washThe collected solid was washed with H2O
  8. washwashed with sat. aq. Na2S2O3
  9. customThe solid was partially dried
  10. dissolutiondissolved in 300 mL hot MeOH
  11. temperaturethe resultant solution was cooled
  12. additionThe cool methanolic solution of product was treated with 200 mL of H2O
  13. filtrationthe white solid filtered

출처 및 근거

ORD 기록
ord-77c8e4dae6fa43fa8856671267722c0a
출처 데이터셋
uspto-grants-2016_05
특허 번호
US09334251B2

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