Diisopropylethylamine → (Z)-N'-(3-(3-(3,5-bis(trifluoromethyl)phenyl)-1H-1,2,4-triazol-1-yl)acryloyl)-1-methylpiperidine-4-carbohydrazide

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

In a 50 mL, 3-neck round-bottom flask, (Z)-3-(3-(3,5-bis(trifluoromethyl)phenyl)-1H-1,2,4-triazol-1-yl)acrylic acid (0.25 g, 1.0 eq.) was dissolved in EtOAc:THF (15 mL; 2:1) and cooled to −60° C. where 1-methylpiperidine-4-carbohydrazide (0.123 g, 1.1 eq.) was introduced. T3P (50% in EtOAc) (0.85 mL, 2 eq.) was added dropwise followed by DIPEA (0.31 mL, 2.5 eq.) and the reaction mixture was stirred for 1 h at −60° C. The reaction mixture was concentrated under reduced pressure (35° C., 20 mm Hg) to afford the crude product that was purified by column chromatography (60/120 silica gel) using methanol/dichloromethane gradient (the column was packed in dichloromethane and the desired compound started eluting from 3% methanol/dichloromethane). Fractions containing the desired compounds were combined to afford (Z)—N′-(3-(3-(3,5-bis(trifluoromethyl)phenyl)-1H-1,2,4-triazol-1-yl)acryloyl)-1-methylpiperidine-4-carbohydrazide (0.016 g, yield: 4.5%).

Herkunft & Nachweise