Water → alpha,alpha-Dimethyl-6-hydroxy-2-naphthaleneacetic acid

HRID 1655559

Reaction equation

HRID 1655559 reaction equation
C[O:2][C:3](=[O:19])[C:4]([CH3:18])([CH3:17])[C:5]1[CH:14]=[CH:13][C:12]2[C:7](=[CH:8][CH:9]=[C:10]([O:15]C)[CH:11]=2)[CH:6]=1.O>Br.C(O)(=O)C>[CH3:17][C:4]([CH3:18])([C:5]1[CH:14]=[CH:13][C:12]2[C:7](=[CH:8][CH:9]=[C:10]([OH:15])[CH:11]=2)[CH:6]=1)[C:3]([OH:19])=[O:2]

Participants

5

Reactant 2

HCID 962WaterHCID 15030202alpha,alpha-Dimethyl-6-methoxy-2-naphthaleneacetic acid methyl ester

Product 1

HCID 15030203alpha,alpha-Dimethyl-6-hydroxy-2-naphthaleneacetic acidYield 93%

Reagents, catalysts & solvents 2

HCID 176Acetic AcidSolventHCID 260Hydrogen BromideSolvent

Procedure

To a solution of (α-methyl-6-methoxy-2-naphthaleneacetic acid methyl ester (12.2 g, 50 mmol) in tetrahydrofuran (100 ml) at -70° C. is added a solution of lithium diisopropylamide in cyclohexane (50 ml, 1.5 equiv). After 20 minutes, methyl iodide (4.0 ml, 1.3 equiv) is added followed by hexamethylphosphoraniide (20 ml). After allowing the reaction mixture to warm to room temperature and stir 16 hours, the reaction is quenched by addition of acetic acid (4.3 ml, 75 mmol). The solvent is then removed and the residue is partitioned between ethyl acetate and water. The organic layer is washed with water 3 times and finally with brine. After drying over magnesium sulfate, the organic extract is evaporated to afford a crude solid. Recrystallization of this solid from hexane affords 8.56 g (66%) of α,α-dimethyl-6-methoxy-2-naphthaleneacetic acid methyl ester as white crystals, m.p. 97°-98° C. A solution of this ester (7.4 g, 28.6 mmol) in 48% HBr (50 ml) and acetic acid (50 ml) is refluxed for 3 hours. After the reaction mixture is cooled to room temperature, 0.8 L of water is added and the reaction mixture is extracted with ethyl acetate 5 times. The combined organic extract is washed sequentially with saturated sodium bicarbonate solution and water. After drying over magnesium sulfate, the organic extract is evaporated to afford 6.1 g (93%) of α,α-dimethyl-6-hydroxy-2-naphthaleneacetic acid as white crystals, m.p. 208°-210° C. The title compound is prepared according to the method of Example 7 using α,α-dimethyl-6-hydroxy-2-naphthaleneacetic acid. A white solid is obtained having a melting point of 207°-209° C.

Workup

  1. extractionthe reaction mixture is extracted with ethyl acetate 5 times
  2. extractionThe combined organic extract
  3. washis washed sequentially with saturated sodium bicarbonate solution and water
  4. dry with materialAfter drying over magnesium sulfate
  5. extractionthe organic extract
  6. customis evaporated

Sources & evidence

ORD record
ord-14d41ce2ca5e42f4a279fae0303c41ff
Source dataset
uspto-grants-1993_10
Patent number
US05250693

Linked notes

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