Trifluoroacetic acid → (R)-3-(6-(3-phenylpiperazin-1-yl)-3-(trifluoromethyl)pyridin-2-yl)-1H-pyrazolo[3,4-b]pyridine

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-(6-bromo-2-pyridyl)-1-trityl-pyrazolo[5,4-b]pyridine (100 mg, 0.1933 mmol) and (2S)-2-phenylpiperazine (54.56 mg, 0.2320 mmol) in DME (2.500 mL) was treated with sodium t-butoxide (27.87 mg, 0.2900 mmol) followed by dicyclohexyl-[2-(o-tolyl)phenyl]phosphane (7.046 mg, 0.01933 mmol) and Palladium acetate (4.340 mg, 0.01933 mmol). The mixture was allowed to stir at 95 degrees in a sealed tube overnight. The mixture was allowed to cool, filtered through celite and concentrated to give a yellow oil. This was taken up in DCM (6 ml) and cooled to 0° C. Triethylsilane (0.12 mL) and TFA (1 mL) were added and the reaction stirred at 0° C. for 1 hour. The solvent was removed in vacuo and the residue purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 uM, 100 A column, gradient 10%-95% B (solvent A: 0.05% TFA in water, solvent B: CH3CN) over 16 minutes at 25 mL/min]. The fractions were collected, passed through a sodium bicarbonate cartridge and freeze-dried to give the title compound as a white solid (20 mg, 29% Yield).

Provenance & Evidence