Water → HCID 23400310, compound

HRID 1062798Notes

Reaction equation

HRID 1062798 reaction equation
[NH2:1][C:2]1[N:6]([CH3:7])[N:5]=[C:4]([OH:8])[C:3]=1[C:9]1[CH:17]=[CH:16][C:12]2[O:13][CH2:14][O:15][C:11]=2[CH:10]=1.C(=O)([O-])[O-].[Cs+].[Cs+].Br[CH2:25][CH2:26][O:27][C:28](=[O:30])[CH3:29].O>CN(C)C=O>[C:28]([O:27][CH2:26][CH2:25][O:8][C:4]1[C:3]([C:9]2[CH:17]=[CH:16][C:12]3[O:13][CH2:14][O:15][C:11]=3[CH:10]=2)=[C:2]([NH2:1])[N:6]([CH3:7])[N:5]=1)(=[O:30])[CH3:29]

Participants

6

Reactant 4

HCID 962WaterHCID 10796Cesium carbonateHCID 135641-Acetoxy-2-bromoethaneHCID 178481945HCID 178481945, compound

Product 1

HCID 23400310HCID 23400310, compoundYield 35.7%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

5-Amino-4-(1,3-benzodioxol-5-yl)-1-methyl-1H-pyrazol-3-ol (Preparation 34) (11.39 g) was dissolved in dimethylformamide (40 ml), cesium carbonate (15.9 g) was added followed by 2-bromoethylacetate (8.16 g). The mixture was stirred at room temperature for 16 hours. The mixture was treated with water (750 ml) and extracted with ethyl acetate (2×250 ml). The organic fractions were combined washed with water (3×350 ml), brine (250 ml), dried over magnesium sulfate, filtered and evaporated. The crude product was purified on silica (300 g) eluting with ethyl acetate:hexane (3:1) to yield the title compound as a white solid (5.57 g).

Workup

  1. extractionextracted with ethyl acetate (2×250 ml)
  2. washThe organic fractions were combined washed with water (3×350 ml), brine (250 ml)
  3. dry with materialdried over magnesium sulfate
  4. filtrationfiltered
  5. customevaporated
  6. customThe crude product was purified on silica (300 g)
  7. washeluting with ethyl acetate:hexane (3:1)

Sources & evidence

ORD record
ord-a8983cb40b0b47b6884f1abab3546654
Source dataset
uspto-grants-2005_11
Patent number
US06962923B2

Reaction notes

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