Citric Acid → HCID 59279527, compound

Participants

Reaction Conditions

Reaction Steps

60% sodium hydride (0.187 g, 4.67 mmol) was added to (S)-methyl 3-(2-(tert-butyldiphenylsilyloxy)ethoxy)-2-hydroxypropanoate (Intermediate AB3) (1.568 g, 3.90 mmol) in anhydrous THF (20 mL) at 0° C. under nitrogen. The resulting solution was stirred at 0° C. for 10 minutes and then 4-chloro-1-(2,5-dimethylphenyl)-1H-pyrazolo[3,4-d]pyrimidine (Intermediate AJ3)(1.008 g, 3.90 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 to give the crude product. This was purified by flash silica chromatography, elution gradient 0 to 20% EtOAc in isohexane to afford the product (1.400 g, 57.5%). m/z (ES+) (M+H)+=625; HPLC tR=3.53 min.

Provenance & Evidence