Water → HCID 13704294, compound

HRID 1583925Notes

Reaction equation

HRID 1583925 reaction equation
[CH3:1][C:2]1([CH3:15])[O:7][C:6]2[CH:8]=[CH:9][C:10]([CH:12]=[O:13])=[CH:11][C:5]=2[CH:4]2[O:14][CH:3]12.[NH:16]1[CH2:20][CH2:19][CH2:18][C:17]1=[O:21].[H-].[Na+].O>CS(C)=O>[CH3:1][C:2]1([CH3:15])[O:7][C:6]2[CH:8]=[CH:9][C:10]([CH:12]=[O:13])=[CH:11][C:5]=2[C@@H:4]([N:16]2[CH2:20][CH2:19][CH2:18][C:17]2=[O:21])[C@@H:3]1[OH:14]

Participants

6

Reactant 4

HCID 962WaterHCID 120252-PyrrolidoneHCID 24758Sodium hydrideHCID 137042811a,7b-Dihydro-2,2-dimethyl-2H-oxireno[c][1]benzopyran-6-carboxaldehyde

Product 1

HCID 13704294HCID 13704294, compound

Reagents, catalysts & solvents 1

HCID 679Dimethyl SulfoxideSolvent

Procedure

To a solution of 3,4-dihydro-2,2-dimethyl-3,4-epoxy-6-formyl-2H-benzo[b]pyran (0.48 g, prepared using the method described in U.K. Pat. No. 1.511.187) and 2-pyrrolidone (0.20 g) in dry dimethyl sulphoxide (30 ml) was added sodium hydride (0.07 g, 80% dispersion in oil). After stirring at room temperature for 4 hours, water was added and the aqueous phase immediately extracted with ethyl acetate. The organic layer was washed with water and brine and dried over magnesium sulphate. Filtration, evaporation and chromatography (chromatotron, pentane-ethyl acetate gradient elution, 2 mm silica gel) gave a fraction (150 mgs) which was recrystallised to give the title compound as crystals (80 mgs) of m.p. 196°-197.5° C.

Workup

  1. extractionthe aqueous phase immediately extracted with ethyl acetate
  2. washThe organic layer was washed with water and brine
  3. dry with materialdried over magnesium sulphate
  4. filtrationFiltration, evaporation and chromatography (chromatotron, pentane-ethyl acetate gradient elution, 2 mm silica gel)
  5. customgave a fraction (150 mgs) which
  6. customwas recrystallised

Sources & evidence

ORD record
ord-37f7edebcef94b238815e0a8fe6c891e
Source dataset
uspto-grants-1985_11
Patent number
US04555509

Reaction notes

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