Triphenylphosphine → Tert-butyl 2-[[4-amino-3-(2-fluoro-4-phenoxy-phenyl)pyrazolo[3,4-d]pyrimidin-1-yl]methyl]azetidine-1-carboxylate

Participants

Reaction Steps

To a mixture of 3-(2-fluoro-4-phenoxy-phenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine (300 mg, 0.930 mmol), tert-butyl 2-(hydroxymethyl)azetidine-1-carboxylate (0.33 mL, 1.9 mmol) and PPh3 (733.86 mg, 2.8 mmol) in THF (10 mL) in ice bath, the DIAD (0.37 mL, 1.87 mmol) as a solution in 5 ml THF was slowly added. The mixture was stirred at RT overnight and then the solvent was removed. To the residue was added H2O and the mixture was extracted with EtOAc. The combined organic layer was washed with NaHCO3, then brine, and dried over Na2SO4. The solvent was removed to get tert-butyl 2-[[4-amino-3-(2-fluoro-4-phenoxy-phenyl)pyrazolo[3,4-d]pyrimidin-1-yl]methyl]azetidine-1-carboxylate weighing 800 mg, which was used without further purification for the next step.

Provenance & Evidence