Water → 6-nitro-2,2,3-trimethyl-4-(2-oxo-1,2-dihydropyridin-1-yl)-2H-1-benzopyran

HRID 1655376Notes

Reaction equation

HRID 1655376 reaction equation
[N+:1]([C:4]1[CH:5]=[CH:6][C:7]2[O:12][C:11]([CH3:14])([CH3:13])[C:10]([CH3:16])(O)[CH:9]([N:17]3[CH:22]=[CH:21][CH:20]=[CH:19][C:18]3=[O:23])[C:8]=2[CH:24]=1)([O-:3])=[O:2].[H-].[Na+].O.C(OCC)(=O)C>O1CCCC1>[N+:1]([C:4]1[CH:5]=[CH:6][C:7]2[O:12][C:11]([CH3:14])([CH3:13])[C:10]([CH3:16])=[C:9]([N:17]3[CH:22]=[CH:21][CH:20]=[CH:19][C:18]3=[O:23])[C:8]=2[CH:24]=1)([O-:3])=[O:2]

Participants

6

Reactant 4

HCID 962WaterHCID 8857Ethyl AcetateHCID 24758Sodium hydrideHCID 221227126-nitro-2,2,3-trimethyl-4-(2-oxo-1,2-dihydropyridin-1-yl)-3,4-dihydro-3-hydroxy-2H-1-benzopyran

Product 1

HCID 221228176-nitro-2,2,3-trimethyl-4-(2-oxo-1,2-dihydropyridin-1-yl)-2H-1-benzopyranYield 48.5%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

A solution of 6-nitro-2,2,3-trimethyl-4-(2-oxo-1,2-dihydropyridin-1-yl)-3,4-dihydro-3-hydroxy-2H-1-benzopyran (3.53 g, 0.0107 mol) in tetrahydrofuran (150 ml) was treated with sodium hydride (80%, 0.32 g). The mixture was heated at reflux for sixteen hours. Water and ethyl acetate were added to the cooled solution and the organic layer separated, dried and evaporated under reduced pressure to afford 1.62 g of 6-nitro-2,2,3-trimethyl-4-(2-oxo-1,2-dihydropyridin-1-yl)-2H-1-benzopyran, m.p. 200° C.

Workup

  1. temperatureThe mixture was heated
  2. temperatureat reflux for sixteen hours
  3. customthe organic layer separated
  4. customdried
  5. customevaporated under reduced pressure

Sources & evidence

ORD record
ord-150d355ea2c24ae190b0681f29bd7607
Source dataset
uspto-grants-1993_10
Patent number
US05250547

Reaction notes

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