2-Cyanoacetyl chloride → HCID 178435091, compound

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Reaction Steps

Then, the obtained hydrazine derivative was dissolved in 50 mL of tetrahydrofuran, and to this solution, 5.1 g of cyanoacetyl chloride was added, followed by stirring at room temperature for 2 hours. Then, the solvent was distilled off under reduced pressure, the residue was dissolved in 50 mL of 1-propanol, and 3.1 g of methanesulfonic acid was added, followed by reflux with heating for 3 hours. After cooling to room temperature, the solvent was distilled off under reduced pressure, followed by neutralization with sodium hydrogen carbonate to a pH of 7, and extraction with ethyl acetate was carried out. The organic layer was dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure to obtain 5.5 g of 5-amino-1-(2-fluoro-4-methyl-5-methylthiophenyl)-3-hydroxypyrazole in the form of yellow crystals (melting point: 230-232° C.).

Provenance & Evidence