Potassium Phosphate, Tribasic → 5-{[(3S)-1-(cyclopropylcarbonyl)-3-pyrrolidinyl]methyl}-4-(4-imidazo[1,2-a]pyridin-7-ylphenyl)-2,4-dihydro-3H-1,2,4-triazol-3-one

Participants

Reaction Conditions

Reaction Steps

A vial was charged with a slurry of 4-(4-bromophenyl)-5-{[(3S)-1-(cyclopropylcarbonyl)-3-pyrrolidinyl]methyl}-2,4-dihydro-3H-1,2,4-triazol-3-one (100 mg, 0.256 mmol), imidazo[1,2-a]pyridin-7-ylboronic acid (83 mg, 0.511 mmol), tetrakis(triphenylphosphine)palladium(0) (29.5 mg, 0.026 mmol) and tripotassium phosphate (217 mg, 1.022 mmol) in absolute ethanol (5.0 mL) and water (5.00 mL) then purged with nitrogen and sealed with a standard teflon septa (crimped aluminum seal). The reaction was then heated in an aluminum block at 95° C. for 6 h. The resulting yellow solution was evaporated in vacuo to a residue that was triturated in DMSO, filtered through a nylon syringe adapter, then purified by reverse phase HPLC (LUNA C-18: 30×50 mm column; 10-40% acetonitrile w/0.1% TFA/water w/0.1% TFA). The desired product fractions were combined, treated with saturated aqueous sodium bicarbonate and evaporated to a residue that was slurried in 5% MeOH in dichloromethane and filtered through a short pad of silica (˜2 g). The filtrate was evaporated in vacuo to afford the title compound as a tan solid (56 mg, 48.6%). MS(ES)+ m/e 429.0 [M+H]+.

Provenance & Evidence