Water → 4-(7-Amino-6-bromo-3-(6-phenylpyridin-3-yl)pyrazolo[1,5-a]pyrimidin-5-yl)-1-hydroxycyclohexanecarboxylic acid

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Reaction Steps

To an ice-cooled mixture of 4-(7-(bis((2-(trimethylsilyl)ethoxy)methyl)amino)-6-bromo-3-(6-phenylpyridin-3-yl)pyrazolo[1,5-a]pyrimidin-5-yl)cyclohexanone (125 mg, 0.173 mmol) and tribromomethane (151 uL, 1.73 mmol) in CH3CN/H2O (1/0.5 mL) was added a solution of KOH in H2O (87.3 mg, 1.56 mmol, 1 g/mL) dropwise during 5 min. The resulting reaction mixture was stirred vigorously at rt overnight. All the volatiles were removed and the residue was treated with TFA/H2O (1/1 mL) overnight. After removal of TFA/H2O, the crude product was purified by a reverse phase HPLC to afford 4-(7-amino-6-bromo-3-(6-phenylpyridin-3-yl)pyrazolo[1,5-a]pyrimidin-5-yl)-1-hydroxycyclohexanecarboxylic acid (Compound 131) as a pale yellow solid (5.0 mg). HPLC-MS TR=1.52 min (UV 254 nm, 5 min method); mass calculated for formula C24H22BrN5O3 507.1, observed LCMS m/z 508.0 (M+H).

Provenance & Evidence