Triethylamine → (E)-3-(1-Methyl-7-oxo-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-n-propoxycinnamic acid t-butyl ester

HRID 327043Notes

Reaction equation

HRID 327043 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[N:16]([CH3:17])[N:15]=[C: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[N:16]([CH3:17])[N:15]=[C: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 1361515895-(5-Bromo-2-propoxyphenyl)-1,6-dihydro-1-methyl-3-propyl-7H-pyrazolo[4,3-d]pyrimidin-7-one

Product 1

HCID 136331508(E)-3-(1-Methyl-7-oxo-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-n-propoxycinnamic acid t-butyl esterYield 58%

Reagents, catalysts & solvents 2

HCID 167845palladium(II) acetateCatalystHCID 6342AcetonitrileSolvent

Procedure

To a solution of 5-(5-bromo-2-n-propoxyphenyl)-1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]-pyrimidin-7-one (1.0 g, 0.0025 mol) and triethylamine (0.38 g, 0.0038 mol) in acetonitrile (2ml), was added palladium(II) acetate (0.03 g, 0.00013 mol), tri-o-tolylphosphine (0.076 g, 0.00025 ,ol) and t-butyl acrylate (0.48 g, 0.0038 mol). The mixture was heated under reflux for 4 hours, then cooled and evaporated under vacuum. The residue was suspended in water (30 ml) and extraction with dichloromethane (3×20 ml) effected. The organic extracts were combined, dried (Na2SO4) and evaported under vacuum to give a yellow-green solid. Chromatography on silica gel (12 g), using a methanol in dichloromethane elution gradient (2-2% methanol), followed by crystallisation from ethyl acetate-hexane gave the title compound as a white solid (0.65 g, 58%), m.p. 167°-168° C. Found: C,66.47; H,7.00; N,12.31. C25H 32 N4O4 requires C,66.35; H,7.13; N,12.38%.

Workup

  1. temperatureThe mixture was heated
  2. temperatureunder reflux for 4 hours
  3. temperaturecooled
  4. customevaporated under vacuum
  5. extractionextraction with dichloromethane (3×20 ml)
  6. dry with materialdried (Na2SO4)
  7. customto give a yellow-green solid
  8. washa methanol in dichloromethane elution gradient (2-2% methanol)
  9. customfollowed by crystallisation from ethyl acetate-hexane

Sources & evidence

ORD record
ord-37d7993d2cae43119bbe42f194379c6d
Source dataset
uspto-grants-1993_12
Patent number
US05272147

Reaction notes

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