2-Chlorobenzaldehyde → 2-[(2-chloro-phenyl)-hydroxy-methyl]-3-(2-methylsulfanyl-pyrimidin-4-yl)-6,7-dihydro-5H-pyrazolo[1,2-a]pyrazol-1-one

HRID 1455259Notes

Reaction equation

HRID 1455259 reaction equation
I[C:2]1[C:9](=[O:10])[N:5]2[CH2:6][CH2:7][CH2:8][N:4]2[C:3]=1[C:11]1[CH:16]=[CH:15][N:14]=[C:13]([S:17][CH3:18])[N:12]=1.C([Mg]Cl)(C)C.[Cl:24][C:25]1[CH:32]=[CH:31][CH:30]=[CH:29][C:26]=1[CH:27]=[O:28]>C1COCC1>[Cl:24][C:25]1[CH:32]=[CH:31][CH:30]=[CH:29][C:26]=1[CH:27]([OH:28])[C:2]1[C:9](=[O:10])[N:5]2[CH2:6][CH2:7][CH2:8][N:4]2[C:3]=1[C:11]1[CH:16]=[CH:15][N:14]=[C:13]([S:17][CH3:18])[N:12]=1

Participants

5

Reactant 3

HCID 69962-ChlorobenzaldehydeHCID 575317902-iodo-3-(2-methylsulfanyl-pyrimidin-4-yl)-6,7-dihydro-5H-pyrazolo[1,2-a]pyrazol-1-oneHCID 178418918HCID 178418918, compound

Product 1

HCID 575317942-[(2-chloro-phenyl)-hydroxy-methyl]-3-(2-methylsulfanyl-pyrimidin-4-yl)-6,7-dihydro-5H-pyrazolo[1,2-a]pyrazol-1-oneYield 58%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Conditions

Temperature
-40 °C

Procedure

To a cold (−40° C.) suspension of 2-iodo-3-(2-methylsulfanyl-pyrimidin-4-yl)-6,7-dihydro-5H-pyrazolo[1,2-a]pyrazol-1-one, 21, (0.40 g, 1.07 mmol) in THF (3 mL) is added dropwise isopropyl-magnesium chloride (0.59 mL of a 2M solution in THF, 1.18 mmol). After stirring for 30 min at −40° C., a solution of 2-chlorobenzaldehyde (0.16 mL, 1.40 mmol) is added dropwise. The reaction mixture is allowed to warm to 0° C. over 1 h period. The mixture is quenched by pouring into aqueous saturated NH4Cl. The aqueous phase is extracted three times with EtOAc and the combined organic phases are dried (MgSO4), filtered and concentrated in vacuo. The crude residue is purified over silica (10% MeOH/chloroform) to afford 240 mg (58% yield) of desired product. 1H NMR (300 MHz, CDCl3) δ 8.56 (d, J=5.1 Hz, 1H), 7.78 (dd, J=7.2, 1.8 Hz, 1H), 7.34-7.18 (m, 2H), 7.01 (d, J=5.1 Hz, 1H), 6.21 (s, 1H), 4.20-4.01 (m, 5H), 2.80-2.70 (m, 2H), 2.58 (s, 3H); ESI+ MS: m/z (rel intensity) 371.1 (100, M++H).

Workup

  1. temperatureto warm to 0° C. over 1 h period
  2. customThe mixture is quenched
  3. additionby pouring into aqueous saturated NH4Cl
  4. extractionThe aqueous phase is extracted three times with EtOAc
  5. dry with materialthe combined organic phases are dried (MgSO4)
  6. filtrationfiltered
  7. concentrationconcentrated in vacuo
  8. customThe crude residue is purified over silica (10% MeOH/chloroform)

Sources & evidence

ORD record
ord-ead8f192c9114bf9a4d87d9af0f47149
Source dataset
uspto-grants-2009_01
Patent number
US07482356B2

Reaction notes

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