Diisopropylethylamine → KPT-330, (E)-RN

Participants

Reaction Steps

To a solution of (E)-3-(3-(3,5-bis(trifluoromethyl)phenyl)-1H-1,2,4-triazol-1-yl)acrylic acid (0.75 g,) in EtOAc (25 mL) and THF (12.5 mL) was added a solution of 2-hydrazinopyrazine (0.23 g) in 12 mL THF at room temperature. T3P (50% in ethyl acetate, 1.52 mL) and DIPEA (1.46 mL) were added dropwise and simultaneously and the reaction mixture was stirred for 30 min at room temperature before being quenched with ice-cold water and extracted with EtOAc (3×25 mL). The combined organic layers were washed with brine, dried over anhydrous Na2SO4 and concentrated under reduced pressure (35° C., 20 mmHg), affording 0.698 g of a crude solid. Trituration first with petroleum ether then with Et2O afforded 275 mg (yield: 29%) (E)-3-(3-(3,5-bis(trifluoromethyl) phenyl)-1H-1,2,4-triazol-1-yl)-N′-(pyrazin-2-yl)acrylohydrazide. 1H NMR (400 MHz, DMSO-d6) δ, 10.3 (s, 1H), 9.15 (s, 2H), 8.59 (s, 2H), 8.30-8.26 (d, J=14.8 Hz, 1H), 8.13 (s, 1H), 8.06-8.07 (m, 1H), 6.98-6.95 (d, J=13.4 Hz, 1H); LCMS for C7H12F6N7O [M+H]+ 443.31. found 444.19 (RT 2.625 min, purity: 99.06%).

Provenance & Evidence