Dimethylformamide → 6-Isobutoxy-2-(2-pyridyl)-4H-1,3-benzothiazine-4-one

HRID 748178Notes

Reaction equation

HRID 748178 reaction equation
[OH:1][C:2]1[CH:3]=[CH:4][C:5]2[S:10][C:9]([C:11]3[CH:16]=[CH:15][CH:14]=[CH:13][N:12]=3)=[N:8][C:7](=[O:17])[C:6]=2[CH:18]=1.[CH2:19](Br)[CH:20]([CH3:22])[CH3:21].C(=O)([O-])[O-].[K+].[K+].CN(C=O)C>O>[CH2:19]([O:1][C:2]1[CH:3]=[CH:4][C:5]2[S:10][C:9]([C:11]3[CH:16]=[CH:15][CH:14]=[CH:13][N:12]=3)=[N:8][C:7](=[O:17])[C:6]=2[CH:18]=1)[CH:20]([CH3:22])[CH3:21]

Participants

6

Reactant 4

HCID 6228DimethylformamideHCID 65551-Bromo-2-methylpropaneHCID 11430Potassium CarbonateHCID 229394706-hydroxy-2-(2-pyridyl)-4H-1,3-benzothiazine-4-one

Product 1

HCID 597501816-Isobutoxy-2-(2-pyridyl)-4H-1,3-benzothiazine-4-oneYield 19.7%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

A mixture of 6-hydroxy-2-(2-pyridyl)-4H-1,3-benzothiazine-4-one (0.35 g, 1.3 mmol), isobutyl bromide (0.64 g, 4.6 mmol) and potassium carbonate (0.57 g, 4.1 mmol) and DMF (10 ml) was stirred at room temperature for 15 hrs. The reaction mixture was diluted with water and extracted with ethyl acetate. The extract was washed with water and dried. The solvent was evaporated. The residue was subjected to a silica gel column chromatography and eluted with hexane-ethyl acetate (2:1, v/v). The obtained crystals were recrystallized from ethyl acetate-hexane to give the titled compound (0.08 g, 19%).

Workup

  1. extractionextracted with ethyl acetate
  2. washThe extract was washed with water
  3. customdried
  4. customThe solvent was evaporated
  5. washeluted with hexane-ethyl acetate (2:1
  6. customThe obtained crystals were recrystallized from ethyl acetate-hexane

Sources & evidence

ORD record
ord-0a0504809583491cae3320e8ff457de0
Source dataset
uspto-grants-2008_07
Patent number
US07399759B2

Reaction notes

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