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

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

In a 25 mL, 3-neck round-bottom flask, (Z)-3-(3-(3,5-bis(trifluoromethyl)phenyl)-1H-1,2,4-triazol-1-yl)acrylic acid (Example 1, Step 4; 0.5 g, 1.0 eq.) was dissolved in dichloromethane (5 mL) and cooled to −60° C. where pyrazine-2-carbohydrazide (0.216 g, 1.1 eq.) was introduced. T3P (50% in EtOAc) (3.39 mL, 4 eq.) was added dropwise followed by DIPEA (0.5 mL, 2 eq.) and the reaction mixture was stirred for 1 h at −60° C. The reaction mixture was concentrated under reduced pressure (25° 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)pyrazine-2-carbohydrazide (0.13 g, yield: 19.4%).

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