N-bromobutanimide → ethyl 4-(7-(bis((2-(trimethylsilyl)ethoxy)methyl)amino)-6-bromo-3-(1-phenyl-1H-pyrazol-4-yl)pyrazolo[1,5-a]pyrimidin-5-yl)-1-(hydroxymethyl)cyclohexanecarboxylate

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Reaction Steps

To a solution of ethyl 4-(7-(bis((2-(trimethylsilyl)ethoxy)methyl)amino)-3-(1-phenyl-1H-pyrazol-4-yl)pyrazolo[1,5-a]pyrimidin-5-yl)-1-(hydroxymethyl)cyclohexanecarboxylate (200 mg, 0.277 mmol) in CH3CN/DCM (5/3 mL) was added NBS (54.3 mg, 0.305 mmol) and stirred at rt for 30 min. TLC showed complete conversion. All the volatiles were removed under reduced pressure and the residue was purified by a SiO2 column (0-35% EtOAc/Hexanes, Rf=0.7 in 50% EtOAc) to afford ethyl 4-(7-(bis((2-(trimethylsilyl)ethoxy)methyl)amino)-6-bromo-3-(1-phenyl-1H-pyrazol-4-yl)pyrazolo[1,5-a]pyrimidin-5-yl)-1-(hydroxymethyl)cyclohexanecarboxylate as a pale yellow oil (201 mg).

Provenance & Evidence