Sodium Carbonate → 3-(4-aminophenyl)-1-cyclopentyl-1H-pyrazolo[3,4-d]pyrimidin-4-amine

HRID 2365759Notes

Reaction equation

HRID 2365759 reaction equation
[N+](C1C=CC(B(O)O)=CC=1)([O-])=O.C1(N2C3=NC=NC(N)=C3C(I)=N2)CCCC1.C(=O)([O-])[O-].[Na+].[Na+].[CH:35]1([N:40]2[C:44]3=[N:45][CH:46]=[N:47][C:48]([NH2:49])=[C:43]3[C:42]([C:50]3[CH:55]=[CH:54][C:53]([N+:56]([O-])=O)=[CH:52][CH:51]=3)=[N:41]2)[CH2:39][CH2:38][CH2:37][CH2:36]1>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.[Pd].[Zn].CC(O)=O.C1COCC1.CCO>[NH2:56][C:53]1[CH:54]=[CH:55][C:50]([C:42]2[C:43]3[C:44](=[N:45][CH:46]=[N:47][C:48]=3[NH2:49])[N:40]([CH:35]3[CH2:39][CH2:38][CH2:37][CH2:36]3)[N:41]=2)=[CH:51][CH:52]=1

Participants

10

Reactant 4

HCID 10340Sodium CarbonateHCID 27735524-Nitrophenylboronic acidHCID 223468081-cyclopentyl-3-iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amineHCID 585067421-cyclopentyl-3-(4-nitrophenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine

Product 1

HCID 585067903-(4-aminophenyl)-1-cyclopentyl-1H-pyrazolo[3,4-d]pyrimidin-4-amine

Reagents, catalysts & solvents 5

HCID 23994ZincCatalystHCID 178527696HCID 178527696, compoundCatalystHCID 176Acetic AcidSolventHCID 702EthanolSolventHCID 8028TetrahydrofuranSolvent

Procedure

Reagent 3-iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine) (0.5 g; 1.9 mmol; Apsel et al., 2008, Id.) was combined with cyclopentyl iodide (0.24 mL; 2.1 mmol), 1.06 g K2CO3, in 20 mL DMF and heated to 45° C. under argon for 2 hours. The reaction was filtered to remove solid K2CO3, and the filtrate was combined with brine and the organic product was extracted in CH2Cl2 (3×50 mL). The combined organic layer was concentrated in vacuo and purified by silica gel chromatography (MeOH/Chloroform; 5:95) to afford 1-cyclopentyl-3-iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine (ESI-MS m/z [M+H]+ found 330.0, calculated 330.0). 4-nitrophenyl boronic acid (190 mg, 1.1 mmol; Sigma-Aldrich), was coupled to 1-cyclopentyl-3-iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine (150 mg, 0.456 mmol) via the Suzuki reaction in 6 mL 1,2 methoxy ethane, 1 mL of saturated sodium carbonate, 1.65 mL EtOH, and 200 mg of polymer-bound tetrakis palladium. The reaction was stirred under argon for 12 hours at room temperature, filtered through Whatman paper to remove palladium, mixed with brine, extracted in chloroform and the product was subsequently purified on silica in EtOAc and concentrated in vacuo. The purified solid 1-cyclopentyl-3-(4-nitrophenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine (ESI-MS m/z [M+H]+ found 325.0, calculated 325.1; 100 mg, 0.31 mmol) was combined with Zinc dust (605 mg, 9.25 mmol), 10 mL THF, 0.35 mL HOAc for 12 hours at room temperature under Argon. The reaction was filtered through Celite®, extracted with EtOAc and concentrated in vacuo to yield 3-(4-aminophenyl)-1-cyclopentyl-1H-pyrazolo[3,4-d]pyrimidin-4-amine (ESI-MS m/z [M+H]+ found 295.0, calculated 295.2). To this reduced product, molar equivalents of 3-(trifluoromethyl)phenyl isocyanate (Sigma-Aldrich) were added dropwise in ice-cold CH2Cl2. The reaction proceeded until completion as judged by TLC, was concentrated in vacuo, resuspended in 50:50 H20-CH3CN, and purified on a C18 column in CH3CN/H20/0.1% TFA (1-100% gradient) to yield AD60 1-(4-(4-amino-1-cyclopentyl-1H-pyrazolo[3,4-d]pyrimidin-3-yl)phenyl)-3-(3-(trifluoromethyl)phenyl)urea (ESI-MS m/z [M+H]+ found 482.2, calculated 482.0).

Workup

  1. filtrationfiltered through Whatman paper
  2. customto remove palladium
  3. additionmixed with brine
  4. extractionextracted in chloroform
  5. customthe product was subsequently purified on silica in EtOAc
  6. concentrationconcentrated in vacuo
  7. filtrationThe reaction was filtered through Celite®
  8. extractionextracted with EtOAc
  9. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-45f069e5de0b47d48b8118bbded4fffb
Source dataset
uspto-grants-2014_04
Patent number
US08697709B2

Reaction notes

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