Methyl bromoacetate → 1-[(4-Methoxy)phenyl]-3-[(methoxycarbonyl)methylamino]-1H-pyrazole

Participants

Reaction Conditions

Reaction Steps

To a solution of 1-[(4-methoxy)phenyl]-3-amino-1H-pyrazole-5-[(2'-tert-butylaminosulfonyl-[1,1']-biphen-4-yl)carboxyamide (1.0 g, 1.92 mmol) in 10 mL of DMF was added sodium bicarbonate (0.24 g, 2.88 mmol) and methyl bromoacetate (0.22 mL, 2.30 mmol) The resulting mixture was stirred at 85° C. for 16 h. The reaction was not complete so additional portions of sodium bicarbonate (0.48 g, 5.76 mmol) and methyl bromoacetate (0.22 mL, 2.30 mmol) were added and the reaction was stirred at 95° C. for 6 h longer. The reaction was cooled to ambient temperature and was diluted with ethyl acetate. The organics were washed with brine, dried (MgSO4) and concentrated in vacuo. The residue was dissolved in 5 mL of trifluoroacetic acid and was stirred at reflux for 20 min and then was cooled to ambient temperature and concentrated in vacuo. The residue was purified by prep HPLC (C18 reverse phase column, elution with a H2O/CH3CN gradient with 0.5% TFA) and lyophilized to afford 450 mg (44%) of the title compound as a white powder. LRMS (ES+): 536.0 (M+H)+.

Provenance & Evidence