Acetic Acid → Methyl 5-bromo-3-(ethylamino)-2-methylbenzoate

HRID 1959240Notes

Reaction equation

HRID 1959240 reaction equation
[NH2:1][C:2]1[C:3]([CH3:13])=[C:4]([CH:9]=[C:10]([Br:12])[CH:11]=1)[C:5]([O:7][CH3:8])=[O:6].[CH:14](=O)[CH3:15].C(O)(=O)C.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>ClC(Cl)C.ClCCl>[Br:12][C:10]1[CH:11]=[C:2]([NH:1][CH2:14][CH3:15])[C:3]([CH3:13])=[C:4]([CH:9]=1)[C:5]([O:7][CH3:8])=[O:6]

Participants

7

Reactant 4

HCID 176Acetic AcidHCID 177AcetaldehydeHCID 5049666Sodium triacetoxyborohydrideHCID 24729181Methyl 3-Amino-5-bromo-2-methylbenzoate

Product 1

HCID 70872675Methyl 5-bromo-3-(ethylamino)-2-methylbenzoateYield 55%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 63651,1-DichloroethaneSolvent

Procedure

To a stirred solution of methyl 3-amino-5-bromo-2-methylbenzoate (1.0 g, 4.09 mmol) and acetaldehyde (180 mg, 4.09 mmol) in dichloroethane (10 mL), acetic acid (1.47 g, 24.58 mmol) was added and reaction stirred at room temperature for 30 minutes. Then sodium triacetoxyborohydride (2.6 g, 12.29 mmol) was added at 0° C., allowed to attain room temperature and stirring continued for 2 h. On completion, reaction mixture was diluted with dichloromethane, washed with water, saturated aqueous sodium bicarbonate solution and dried over sodium sulphate. Removal of the solvent under reduced pressure followed by column chromatographic purification afforded the desired compound (600 mg, 55%).

Workup

  1. customreaction
  2. customto attain room temperature
  3. stirringstirring
  4. waitcontinued for 2 h
  5. customOn completion, reaction mixture
  6. washwashed with water, saturated aqueous sodium bicarbonate solution
  7. dry with materialdried over sodium sulphate
  8. customRemoval of the solvent under reduced pressure
  9. customfollowed by column chromatographic purification

Sources & evidence

ORD record
ord-135d551ed48b401082e79a3c238ea883
Source dataset
uspto-grants-2013_04
Patent number
US08410088B2

Reaction notes

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