Potassium Dichromate → 5-[3,6-Dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-1,2-benzisothiazole-3-carboxylic acid

HRID 48984

Reaction equation

HRID 48984 reaction equation
[Cr](O[Cr]([O-])(=O)=O)([O-])(=O)=O.[K+].[K+].[OH:12][CH2:13][C:14]1[C:18]2[CH:19]=[C:20]([N:23]3[C:28](=[O:29])[CH:27]=[C:26]([C:30]([F:33])([F:32])[F:31])[N:25]([CH3:34])[C:24]3=[O:35])[CH:21]=[CH:22][C:17]=2[S:16][N:15]=1.CN1C(C(F)(F)F)=CC(=[O:47])N(C2C=CC3SN=C(C=O)C=3C=2)C1=O>S(=O)(=O)(O)O.C(O)(=O)C.O>[CH3:34][N:25]1[C:26]([C:30]([F:32])([F:31])[F:33])=[CH:27][C:28](=[O:29])[N:23]([C:20]2[CH:21]=[CH:22][C:17]3[S:16][N:15]=[C:14]([C:13]([OH:47])=[O:12])[C:18]=3[CH:19]=2)[C:24]1=[O:35]

Participants

7

Reactant 3

HCID 24502Potassium DichromateHCID 178523685-[3,6-dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-1, 2-benzisothiazole-3-carboxaldehydeHCID 221198213-[3-(hydroxymethyl)-1,2-benzisothiazol-5-yl]-1-methyl-6-(trifluoromethyl)-2,4(1H,3H)-pyrimidinedione

Product 1

HCID 111878605-[3,6-Dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-1,2-benzisothiazole-3-carboxylic acid

Reagents, catalysts & solvents 3

HCID 176Acetic AcidSolventHCID 962WaterSolventHCID 1118Sulfuric AcidSolvent

Procedure

A solution of potassium dichromate (10.0 g) in 1.5 M sulfuric acid (200 mL) is cooled to 0° C., treated dropwise with a solution of a 2:3 mixture of 3-[3-(hydroxymethyl)-1,2-benzisothiazol-5-yl]-1-methyl-6-(trifluoromethyl)-2,4(1H,3H)-pyrimidinedione and 5-[3,6-dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-1,2-benzisothiazole-3-carboxaldehyde (12.0 g) in acetic acid, stirred at room temperature for 2 hours, and diluted with water. The resultant aqueous mixture is extracted with methylene chloride. The organic extracts are combined, washed sequentially with water and brine, dried over anhydrous sodium sulfate, and concentrated in vacuo to give the title product as a white solid (8.50 g, mp 149-152° C.).

Workup

  1. extractionThe resultant aqueous mixture is extracted with methylene chloride
  2. washwashed sequentially with water and brine
  3. dry with materialdried over anhydrous sodium sulfate
  4. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-565e9ea917874e72a29ac18a98704b66
Source dataset
uspto-grants-2004_03
Patent number
US06706663B2

Linked notes

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