HCID 18690998, compound → Ethyl 5-hydroxy-2-methylbenzoate

HRID 1640024Notes

Reaction equation

HRID 1640024 reaction equation
N[C:2]1[CH:3]=[CH:4][C:5]([CH3:13])=[C:6]([CH:12]=1)[C:7]([O:9][CH2:10][CH3:11])=[O:8].N([O-])=[O:15].[Na+]>S(=O)(=O)(O)O.O.C(OCC)(=O)C>[OH:15][C:2]1[CH:3]=[CH:4][C:5]([CH3:13])=[C:6]([CH:12]=1)[C:7]([O:9][CH2:10][CH3:11])=[O:8]

Participants

6

Reactant 2

HCID 18690998HCID 18690998, compoundHCID 23668193Sodium Nitrite

Product 1

HCID 15730468Ethyl 5-hydroxy-2-methylbenzoateYield 86.2%

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 1118Sulfuric AcidSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
0 °C

Procedure

A mixture of ethyl 5-amino-2-methylbenzoate (14.4 g, 80.3 mmol) in aqueous 5% sulfuric acid (300 mL) was cooled with an ice-bath for 15 min. Sodium nitrite (6.09 g, 88.3 mmol) was then added dropwise as a solution in water (50 mL), and the resulting mixture stirred for at 0° C. for 30 min. After this time, the resulting mixture was heated to 60° C. for 18 h. The reaction mixture was then cooled to room temperature and diluted with ethyl acetate (150 mL). The organic layer was separated, dried over sodium sulfate, filtered, and concentrated under reduced pressure. Purification by flash chromatography (silica, gradient 0-40%, hexanes/ethyl acetate) afforded 12.48 g (86%) of ethyl 5-hydroxy-2-methylbenzoate as red-brown solid: 1H NMR (300 MHz, CDCl3) δ 7.44 (d, J=2.8 Hz, 1H), 7.10 (d, J=8.3 Hz, 1H), 6.91 (dd, J=8.3, 2.8 Hz, 1H), 5.44 (s, 1H), 4.35 (q, J=7.1 Hz, 2H), 2.50 (s, 3H), 1.38 (t, J=7.1 Hz, 3H); ESI MS m/z 181 [M+H]+.

Workup

  1. temperaturewas cooled with an ice-bath for 15 min
  2. temperatureAfter this time, the resulting mixture was heated to 60° C. for 18 h
  3. temperatureThe reaction mixture was then cooled to room temperature
  4. customThe organic layer was separated
  5. dry with materialdried over sodium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated under reduced pressure
  8. customPurification by flash chromatography (silica, gradient 0-40%, hexanes/ethyl acetate)

Sources & evidence

ORD record
ord-71ac9c2794b646c599403fac490a8a24
Source dataset
uspto-grants-2012_02
Patent number
US08110681B2

Reaction notes

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