Triacetoxyperiodinane → Ethyl 6-(2-ethoxy-2-oxoacetyl)-7-iodo-5-methylpyrazolo[1,5-a]pyrimidine-2-carboxylate

HRID 1630307Notes

Reaction equation

HRID 1630307 reaction equation
[CH2:1]([O:3][C:4](=[O:23])[CH:5]([C:7]1[C:8]([CH3:22])=[N:9][C:10]2[N:11]([N:14]=[C:15]([C:17]([O:19][CH2:20][CH3:21])=[O:18])[CH:16]=2)[C:12]=1[I:13])[OH:6])[CH3:2].CC(OI1(OC(C)=O)(OC(C)=O)OC(=O)C2C=CC=CC1=2)=O>C(Cl)Cl.C(OCC)(=O)C>[CH2:1]([O:3][C:4](=[O:23])[C:5]([C:7]1[C:8]([CH3:22])=[N:9][C:10]2[N:11]([N:14]=[C:15]([C:17]([O:19][CH2:20][CH3:21])=[O:18])[CH:16]=2)[C:12]=1[I:13])=[O:6])[CH3:2]

Participants

5

Reactant 2

HCID 159087TriacetoxyperiodinaneHCID 86691586Ethyl 6-(2-ethoxy-1-hydroxy-2-oxoethyl)-7-iodo-5-methylpyrazolo[1,5-a]pyrimidine-2-carboxylate

Product 1

HCID 86691587Ethyl 6-(2-ethoxy-2-oxoacetyl)-7-iodo-5-methylpyrazolo[1,5-a]pyrimidine-2-carboxylateYield 91%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a mixture of ethyl 6-(2-ethoxy-1-hydroxy-2-oxoethyl)-7-iodo-5-methylpyrazolo[1,5-a]pyrimidine-2-carboxylate (3.7 g, 6.41 mmol) in CH2Cl2 (80 mL) was added Dess-Martin Periodinane (2.72 g, 6.41 mmol) and the resulting mixture was stirred at rt for 1 hr. Then diluted with ethyl acetate (500 mL) and washed with sat. NaHCO3 solution (100 mL), dried (Na2SO4), filtered, concentrated and the residue was purified by silica gel chromatography (5-70% EtOAc/hexane) to afford desired ethyl 6-(2-ethoxy-2-oxoacetyl)-7-iodo-5-methylpyrazolo[1,5-a]pyrimidine-2-carboxylate (2.5 g, 5.80 mmol, 91% yield) as off-white solid. 1H NMR (400 MHz, CDCl3) δ: 7.36 (s, 1H), 4.50 (dq, J=14.5, 7.1 Hz, 4H), 2.56 (s, 3H), 1.46 (t, J=7.2 Hz, 3H), 1.48 (t, J=7.2 Hz, 3H). LCMS (M+H)=431.87.

Workup

  1. washwashed with sat. NaHCO3 solution (100 mL)
  2. dry with materialdried (Na2SO4)
  3. filtrationfiltered
  4. concentrationconcentrated
  5. customthe residue was purified by silica gel chromatography (5-70% EtOAc/hexane)

Sources & evidence

ORD record
ord-78edf3f58ab14dc2bcd9300d0ac3afe7
Source dataset
uspto-grants-2014_07
Patent number
US08791108B2

Reaction notes

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