Diisopropylethylamine → 5-{5-[4-(Ethyloxy)-3,5-difluorophenyl]-1,2,4-oxadiazol-3-yl}isoquinoline

Participants

Reaction Steps

A mixture of 4-(ethyloxy)-3,5-difluorobenzoic acid (JRD Fluorochemicals Ltd; 130 mg, 0.641 mmol), HATU (244 mg, 0.641 mmol), Hunig's base (0.3 mL, 1.718 mmol) in N,N-dimethylformamide (DMF) (1 ml) was stirred at room temperature for 1 hr before the addition of N-hydroxy-5-isoquinolinecarboximidamide (D1; 100 mg, 0.534 mmol) in N,N-dimethylformamide (DMF) (1 ml). The reaction mixture was stirred at room temperature for 2-3 hrs and then heated in a microwave at 140° C. for 1.5 hr. The reaction mixture was concentrated in vacuo and purified by preparative HPLC (Waters Atlantis column, eluting with solvents A/B (A: Water+0.1% Formic acid, B: MeCN+0.1% Formic acid)) to give the title compound (11 mg)

Provenance & Evidence