Diisopropylethylamine → (Z)-3-(3-(3,5-bis(trifluoromethyl)phenyl)-1H-1,2,4-triazol-1-yl)-N-(4-ethylpiperazin-1-yl)acrylamide

Participants

Reaction Conditions

Reaction Steps

A cold (−40° C.) solution of (Z)-3-(3-(3,5-bis(trifluoromethyl)phenyl)-1H-1,2,4-triazol-1-yl)acrylic acid (0.25 g) in EtOAc (20 mL) was treated with 4-ethylpiperazin-1-amine (0.12 g). T3P (50% in EtOAc, 0.84 mL) and DIPEA (0.24 mL) were added simultaneously and the reaction mixture was stirred for 30 min at −40° C. before being quenched with ice-cold water and extracted with EtOAc (3×20 mL). The combined organic extracts were washed with brine, dried over anhydrous Na2SO4 and concentrated under reduced pressure (35° C., 20 mmHg) to afford 0.280 g of crude compound. Purification by combi-flash chromatography (eluting with 2% MeOH in CH2Cl2) followed by purification on a preparative TLC plate (eluting with 10% MeOH in CH2Cl2) afforded 60 mg (Z)-3-(3-(3,5-bis(trifluoromethyl)phenyl)-1H-1,2,4-triazol-1-yl)-N-(4-ethylpiperazin-1-yl)acrylamide. 1H NMR (400 MHz, CF3COOD) δ: 10.75 (s, 1H), 8.31-8.29 (d, J=10.2H), 7.98 (s, 1H), 7.21-7.23 (d, 1H), 6.08-6.10 (d, 1H), 3.52-3.54 (m, 3H), 3.36 (s, 1H), 3.11 (m, 8H), 1.19-1.22 (m, 3H); LCMS for C19H21F6N6O [M+H]+ 463.40. found 463.23 (RT 2.43 min, purity: 98.63%).

Provenance & Evidence