Acetovanillone → 2',3'-Dihydroxyacetophenone

HRID 38631

Reaction equation

HRID 38631 reaction equation
[CH3:1][C:2]([C:4]1[CH:12]=[CH:11][C:9](O)=[C:6]([O:7]C)[CH:5]=1)=[O:3].C([O-])([O-])=[O:14].[K+].[K+].C(Br)C1C=CC=CC=1>CC#N>[CH3:1][C:2]([C:4]1[CH:12]=[CH:11][CH:9]=[C:6]([OH:7])[C:5]=1[OH:14])=[O:3]

Participants

5

Reactant 3

HCID 2214AcetovanilloneHCID 7498Benzyl BromideHCID 11430Potassium Carbonate

Product 1

HCID 64291102',3'-DihydroxyacetophenoneYield 70.3%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Conditions

Temperature
25 °C

Procedure

To a solution of acetovanillone (33) (4.70 g, 28.3 mmol) in MeCN (60 mL) was added K2CO3 (8.05 g, 58.3 mmol) and KI (0.20 g, 1.2 mmol). The mixture was stirred under N2 atmosphere and benzyl bromide (34) (4.0 mL, 34 mmol) was added dropwise. The reaction mixture was reflux for 24 h and then cooled to 25° C., then resulting precipitate was filtered off. The filtrate was evaporated and purified by column chromatography (SiO2, n-hexane: CH2Cl2=1:2) to give 30. White solid; yield: 70.3%; mp 87-88° C.; 1H-NMR (CDCl3. 200 MHz): δ 2.51 (s, 3H), 3.91 (s, 3H), 5.20 (s, 2H), 6.86 (d, J=8.2 Hz, 1H), 7.21-7.55 (m, 7H); 13C-NMR (CDCl3, 50 MHz): δ 26.19, 56.05, 70.79, 110.53, 112.13, 123.07, 127.18, 128.10, 128.68, 130.72, 136.28, 149.49, 152.41, 196.80; Anal. calcd for C16H16O3: C, 74.98; H, 6.29. Found: C, 75.02; H, 6.25.

Workup

  1. temperatureThe reaction mixture was reflux for 24 h
  2. customresulting precipitate
  3. filtrationwas filtered off
  4. customThe filtrate was evaporated
  5. custompurified by column chromatography (SiO2, n-hexane: CH2Cl2=1:2)

Sources & evidence

ORD record
ord-904a19f9ad764a429ae73edd9fd181c0
Source dataset
uspto-grants-2013_09
Patent number
US08524740B2

Linked notes

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