Gallacetophenone → 5-Hydroxy-3-(hydroxymethyl)-2,3-dihydro-1,4-benzodioxin-6-yl-1-ethanone

HRID 2056363Notes

Reaction equation

[OH:1][C:2]1[C:7]([OH:8])=[C:6]([OH:9])[CH:5]=[CH:4][C:3]=1[C:10](=[O:12])[CH3:11].C(=O)([O-])[O-].[K+].[K+].S(C1C=CC(C)=CC=1)([O:22][CH2:23][C@@H:24]1O[CH2:25]1)(=O)=O>CN(C=O)C>[OH:1][C:2]1[C:7]2[O:8][CH:24]([CH2:23][OH:22])[CH2:25][O:9][C:6]=2[CH:5]=[CH:4][C:3]=1[C:10](=[O:12])[CH3:11]

Participants

Conditions

Temperature: 70 °C

Procedure

To a solution of 2′,3′,4′-trihydroxyacetophenone (10.6 g, 63:0 mmole) in DMF (75 mL) was added potassium carbonate (17.4 g, 126 mmole). After 5 minutes (R)-glycidyl tosylate (9.67 g, 42.3 mmole) was added, then the heterogeneous mixture was heated to 70° C. for 3 hours. After removal of the solvent in vacuum, the residue was taken into water (800 mL) and was then extracted with ethyl acetate (4×300 mL). The combined organic layers were dried over magnesium sulfate, filtered and evaporate to dryness in vacuum. The crude brown oil thus obtained was column chromatographed on silica gel with 40% hexane/ethyl acetate as eluent to give the (S)-enantiomer of the title compound as a yellow oil which solidifies upon standing (7.5 g, 78%). MS (ESI) m/z 223 (M−H)−.

Workup

customAfter removal of the solvent in vacuum
extractionwas then extracted with ethyl acetate (4×300 mL)
dry with materialThe combined organic layers were dried over magnesium sulfate
filtrationfiltered
customevaporate to dryness in vacuum
customThe crude brown oil thus obtained
customchromatographed on silica gel with 40% hexane/ethyl acetate as eluent

Sources & evidence

ORD record: ord-51b6d78a0b114289bb6dbea5f2ca6d3e
Source dataset: uspto-grants-2008_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07335666B2

Reaction notes

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