Citric Acid → (2S)-methyl 3-(2-(tert-butyldiphenylsilyloxy)ethoxy)-2-(1-(5-fluoro-2-methylphenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yloxy)propanoate

HRID 1098204Notes

Reaction equation

HRID 1098204 reaction equation
[H-].[Na+].[Si:3]([O:20][CH2:21][CH2:22][O:23][CH2:24][C@H:25]([OH:30])[C:26]([O:28][CH3:29])=[O:27])([C:16]([CH3:19])([CH3:18])[CH3:17])([C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1)[C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1.Cl[C:32]1[N:37]=[CH:36][N:35]=[C:34]2[N:38]([C:41]3[CH:46]=[C:45]([F:47])[CH:44]=[CH:43][C:42]=3[CH3:48])[N:39]=[CH:40][C:33]=12.C(O)(=O)CC(CC(O)=O)(C(O)=O)O>C1COCC1>[Si:3]([O:20][CH2:21][CH2:22][O:23][CH2:24][C@H:25]([O:30][C:32]1[N:37]=[CH:36][N:35]=[C:34]2[N:38]([C:41]3[CH:46]=[C:45]([F:47])[CH:44]=[CH:43][C:42]=3[CH3:48])[N:39]=[CH:40][C:33]=12)[C:26]([O:28][CH3:29])=[O:27])([C:16]([CH3:19])([CH3:18])[CH3:17])([C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1)[C:4]1[CH:5]=[CH:6][CH:7]=[CH:8][CH:9]=1

Participants

6

Reactant 4

HCID 311Citric AcidHCID 24758Sodium hydrideHCID 574386624-chloro-1-(5-fluoro-2-methylphenyl)-1H-pyrazolo[3,4-d]pyrimidineHCID 59279512(S)-methyl 3-(2-(tert-butyldiphenylsilyloxy)ethoxy)-2-hydroxypropanoate

Product 1

HCID 59279498(2S)-methyl 3-(2-(tert-butyldiphenylsilyloxy)ethoxy)-2-(1-(5-fluoro-2-methylphenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yloxy)propanoateYield 53.3%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
0 °C

Procedure

60% Sodium hydride (156 mg, 3.89 mmol) was added to (S)-methyl 3-(2-(tert-butyldiphenylsilyloxy)ethoxy)-2-hydroxypropanoate (Intermediate AB3) (1119 mg, 2.78 mmol) in anhydrous THF (15 mL) at 0° C. under nitrogen. The resulting solution was stirred at 0° C. for 10 minutes and then 4-chloro-1-(5-fluoro-2-methylphenyl)-1H-pyrazolo[3,4-d]pyrimidine (Intermediate AK3) (730 mg, 2.78 mmol) was added. The reaction mixture was allowed to warm to room temperature and stirred for 1 hour. The reaction mixture was neutralised with 1M citric acid and the majority of the THF removed in vacuo. The residue was diluted with water (20 mL) and EtOAc (100 mL). The organic layer was separated and the aqueous layer re-extracted with EtOAc (100 mL). The combined organics were washed with saturated brine (75 mL), dried (MgSO4) and evaporated. The crude product was purified by flash silica (120 g) chromatography, elution gradient 0 to 20% EtOAc in isohexane to afford the product (932 mg, 53.3%). 1H NMR (400 MHz, DMSO) δ 0.94 (9H, s), 2.03 (3H, s), 3.80-3.65 (7H, m), 4.16-4.03 (2H, m), 5.89 (1H, dd), 7.46-7.33 (8H, m), 7.54-7.48 (1H, m), 7.65-7.61 (4H, m), 8.48 (1H, s), 8.59 (1H, s); m/z (ES+) (M+H)+=629; HPLC tR=3.41 min.

Workup

  1. temperatureto warm to room temperature
  2. stirringstirred for 1 hour
  3. customthe majority of the THF removed in vacuo
  4. additionThe residue was diluted with water (20 mL) and EtOAc (100 mL)
  5. customThe organic layer was separated
  6. extractionthe aqueous layer re-extracted with EtOAc (100 mL)
  7. washThe combined organics were washed with saturated brine (75 mL)
  8. dry with materialdried (MgSO4)
  9. customevaporated
  10. customThe crude product was purified by flash silica (120 g) chromatography, elution gradient 0 to 20% EtOAc in isohexane

Sources & evidence

ORD record
ord-e8bd294d99524ae78d09a0a9b3fa4c27
Source dataset
uspto-grants-2012_03
Patent number
US08143263B2

Reaction notes

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