Triethylamine → (E)-3-(3-methyl-4-oxo-1-n-propyl-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-6-yl)-4-n-propoxycinnamic acid t-butyl ester

HRID 1532069Notes

Reaction equation

HRID 1532069 reaction equation
Br[C:2]1[CH:3]=[CH:4][C:5]([O:22][CH2:23][CH2:24][CH3:25])=[C:6]([C:8]2[NH:9][C:10](=[O:21])[C:11]3[C:16]([CH3:17])=[N:15][N:14]([CH2:18][CH2:19][CH3:20])[C:12]=3[N:13]=2)[CH:7]=1.C(N(CC)CC)C.C1(C)C=CC=CC=1P(C1C=CC=CC=1C)C1C=CC=CC=1C.[C:55]([O:59][C:60]([CH3:63])([CH3:62])[CH3:61])(=[O:58])[CH:56]=[CH2:57]>C(#N)C.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[C:60]([O:59][C:55](=[O:58])/[CH:56]=[CH:57]/[C:2]1[CH:3]=[CH:4][C:5]([O:22][CH2:23][CH2:24][CH3:25])=[C:6]([C:8]2[NH:9][C:10](=[O:21])[C:11]3[C:16]([CH3:17])=[N:15][N:14]([CH2:18][CH2:19][CH3:20])[C:12]=3[N:13]=2)[CH:7]=1)([CH3:63])([CH3:62])[CH3:61]

Participants

7

Reactant 4

HCID 8471TriethylamineHCID 15458tert-Butyl acrylateHCID 80271Tri-o-tolylphosphineHCID 1361090086-(5-Bromo-2-n-propoxyphenyl)-3-methyl-1-n-propyl-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one

Product 1

HCID 135450039(E)-3-(3-methyl-4-oxo-1-n-propyl-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-6-yl)-4-n-propoxycinnamic acid t-butyl esterYield 61.7%

Reagents, catalysts & solvents 2

HCID 167845palladium(II) acetateCatalystHCID 6342AcetonitrileSolvent

Procedure

To a solution of 6-(5-bromo-2-n-propoxyphenyl)-3-methyl-1-n-propyl-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one (Example 11; 2.14 g, 0.0053 mol) and triethylamine (0.81 g, 0.008 mol) in acetonitrile (4 ml), was added palladium(II) acetate (0.06 g, 0.00027 mol), tri-o-tolylphosphine (0.16 g, 0.00053 mol) and t-butyl acrylate (1.03 g, 0.008 mol). The mixture was heated under reflux for 4 hours, cooled to room temperature and then partitioned between water (30 ml) and dichloromethane (30 ml). The organic phase was removed and the aqueous phase extracted with dichloromethane (2×30 ml). The combined organic solutions were dried (Na2SO4) and the solvent removed by evaporation under vacuum to give a greenish brown solid. Purification by column chromatography (SiO2, CH2Cl2 then 2% MeOH in CH2Cl2) and crystallisation from ethyl acetate-hexane afforded the title compound as white crystals (1.48 g, 58%), m.p. 181-182° C. Found: C, 66.50; H, 6.75; N, 12.27. C25H32N4O4 requires C, 66.35; H, 7.12; N, 12.38%.

Workup

  1. temperatureThe mixture was heated
  2. temperatureunder reflux for 4 hours
  3. custompartitioned between water (30 ml) and dichloromethane (30 ml)
  4. customThe organic phase was removed
  5. extractionthe aqueous phase extracted with dichloromethane (2×30 ml)
  6. dry with materialThe combined organic solutions were dried (Na2SO4)
  7. customthe solvent removed by evaporation under vacuum
  8. customto give a greenish brown solid
  9. customPurification by column chromatography (SiO2, CH2Cl2
  10. custom2% MeOH in CH2Cl2) and crystallisation from ethyl acetate-hexane

Sources & evidence

ORD record
ord-0b79fa30434a41ef89f26a851487d9ba
Source dataset
uspto-grants-2001_03
Patent number
US06200980B1

Reaction notes

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