2-Amino-5-chloropyridine → (2S)-3-(2-(tert-butyldiphenylsilyloxy)ethoxy)-N-(5-chloropyridin-2-yl)-2-(1-(5-fluoro-2-methylphenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yloxy)propanamide

HRID 1098205Notes

Reaction equation

HRID 1098205 reaction equation
C[Al](C)C.[Cl:5][C:6]1[CH:7]=[CH:8][C:9]([NH2:12])=[N:10][CH:11]=1.[Si:13]([O:30][CH2:31][CH2:32][O:33][CH2:34][C@H:35]([O:40][C:41]1[N:46]=[CH:45][N:44]=[C:43]2[N:47]([C:50]3[CH:55]=[C:54]([F:56])[CH:53]=[CH:52][C:51]=3[CH3:57])[N:48]=[CH:49][C:42]=12)[C:36](OC)=[O:37])([C:26]([CH3:29])([CH3:28])[CH3:27])([C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1)[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1>C1(C)C=CC=CC=1.CCOC(C)=O>[Si:13]([O:30][CH2:31][CH2:32][O:33][CH2:34][C@H:35]([O:40][C:41]1[N:46]=[CH:45][N:44]=[C:43]2[N:47]([C:50]3[CH:55]=[C:54]([F:56])[CH:53]=[CH:52][C:51]=3[CH3:57])[N:48]=[CH:49][C:42]=12)[C:36]([NH:12][C:9]1[CH:8]=[CH:7][C:6]([Cl:5])=[CH:11][N:10]=1)=[O:37])([C:26]([CH3:27])([CH3:28])[CH3:29])([C:20]1[CH:21]=[CH:22][CH:23]=[CH:24][CH:25]=1)[C:14]1[CH:15]=[CH:16][CH:17]=[CH:18][CH:19]=1

Participants

6

Reactant 3

HCID 661742-Amino-5-chloropyridineHCID 16682925TrimethylaluminumHCID 59279498(2S)-methyl 3-(2-(tert-butyldiphenylsilyloxy)ethoxy)-2-(1-(5-fluoro-2-methylphenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yloxy)propanoate

Product 1

HCID 57504535(2S)-3-(2-(tert-butyldiphenylsilyloxy)ethoxy)-N-(5-chloropyridin-2-yl)-2-(1-(5-fluoro-2-methylphenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yloxy)propanamideYield 72.7%

Reagents, catalysts & solvents 2

HCID 1140TolueneSolvent2×HCID 8857Ethyl AcetateSolvent

Conditions

Temperature
100 °C

Procedure

Trimethylaluminium (2M in toluene) (0.556 mL, 1.11 mmol) was added dropwise to a stirred solution of 5-chloropyridin-2-amine (143 mg, 1.11 mmol) in toluene (10 mL), under nitrogen at 0° C. The resulting solution was allowed to stir at this temperature for a further 20 minutes. (2S)-methyl 3-(2-(tert-butyldiphenylsilyloxy)ethoxy)-2-(1-(5-fluoro-2-methylphenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yloxy)propanoate (Intermediate AK4) (466 mg, 0.74 mmol) in toluene (5 mL) was added slowly to the mixture at 0° C. The reaction mixture was then heated to 100° C. and was stirred for 6 hours using the microwave. The reaction mixture was allowed to cool to ambient temperature, then evaporated to afford a gum. This was dissolved in EtOAc (75 mL), and washed sequentially with Rochelle's solution (20 mL), and water (20 mL). The organic layer was dried (MgSO4), filtered and evaporated to afford crude product. The crude product was purified by flash silica chromatography, elution gradient 10 to 30% EtOAc in isohexane to afford the product (390 mg, 72.6%). 1H NMR (400 MHz, DMSO) δ 0.88 (9H, s), 2.03 (3H, s), 3.82-3.67 (4H, m), 4.05 (1H, m), 4.15 (1H, m), 6.00 (1H, m), 7.45-7.31 (8H, m), 7.50 (1H, t), 7.60 (4H, m), 7.87 (1H, dd), 8.02 (1H, d), 8.40 (1H, d), 8.51 (1H, s), 8.56 (1H, s), 11.25 (1H, s); m/z (ES+) (M+H)+=725; HPLC tR=3.63 min.

Workup

  1. stirringwas stirred for 6 hours
  2. temperatureto cool to ambient temperature
  3. customevaporated
  4. customto afford a gum
  5. washwashed sequentially with Rochelle's solution (20 mL), and water (20 mL)
  6. dry with materialThe organic layer was dried (MgSO4)
  7. filtrationfiltered
  8. customevaporated
  9. customto afford crude product
  10. customThe crude product was purified by flash silica chromatography, elution gradient 10 to 30% EtOAc in isohexane

Sources & evidence

ORD record
ord-2f6d307e7b63436794118920ddb09bdf
Source dataset
uspto-grants-2012_03
Patent number
US08143263B2

Reaction notes

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