Salicylamide → 2,2-dibutyl-4-oxo-2,3-dihydro-4H-1,3-benzoxazine

HRID 1756886

Reaction equation

HRID 1756886 reaction equation
[CH2:1]([C:5]([CH2:7][CH2:8][CH2:9][CH3:10])=[O:6])[CH2:2][CH2:3][CH3:4].[C:11]([NH2:20])(=[O:19])[C:12]1[C:13](=[CH:15][CH:16]=[CH:17][CH:18]=1)O.O.C1(C)C=CC(S(O)(=O)=O)=CC=1>C1(C)C=CC=CC=1>[CH2:1]([C:5]1([CH2:7][CH2:8][CH2:9][CH3:10])[NH:20][C:11](=[O:19])[C:12]2[CH:13]=[CH:15][CH:16]=[CH:17][C:18]=2[O:6]1)[CH2:2][CH2:3][CH3:4]

Participants

5

Reactant 3

HCID 5147SalicylamideHCID 104055-NonanoneHCID 521998p-Toluenesulfonic acid monohydrate

Product 1

HCID 100840172,2-dibutyl-4-oxo-2,3-dihydro-4H-1,3-benzoxazineYield 92.5%

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

A mixture of 20 g of dibutylketone, 19.3 g of salicylamide and 2.7 g of p-toluenesulfonic acid monohydrate is added to 300 ml of toluene and the mixture is refluxed overnight by making use of a dehydrator of Dean Stark. After cooling, the reaction mixture is washed, dried and evaporated to remove the solvent. The residue is purified by silica gel column chromatography (solvent; hexane:ethyl acetate =95:5) to obtain 34 g of 2,2-dibutyl-4-oxo-2,3-dihydro-4H-1,3-benzoxazine as a yellow oil.

Workup

  1. temperaturethe mixture is refluxed overnight
  2. temperatureAfter cooling
  3. washthe reaction mixture is washed
  4. customdried
  5. customevaporated
  6. customto remove the solvent
  7. customThe residue is purified by silica gel column chromatography (solvent; hexane:ethyl acetate =95:5)

Sources & evidence

ORD record
ord-9efcac42f446489ba5cf5243c6c30bd3
Source dataset
uspto-grants-1995_08
Patent number
US05442055

Linked notes

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