3-Amino-3-Oxopropanoic Acid → 2-Carbamoyl-3-(1-methyl-3-nitro-4-pyrazolyl)-acrylic acid

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Reaction Steps

When the reaction of 1-methyl-3-nitropyrazole-4-aldehyde and malonic acid monoamide in pyridine is carried out at 70° C., then, as intermediate product, there can be isolated 2-carbamoyl-3-(1-methyl-3-nitro-4-pyrazolyl)-acrylic acid. For decarboxylation, 0.1 g. of this product is stirred in 1 ml. pyridine for 1.5 hours at a bath temperature of 120° C. The reaction mixture is then cooled, ice-cold semi-concentrated hydrochloric acid is added thereto and the precipitated crystals are filtered off with suction, washed with water and dried. There is obtained 0.02 g. 3-(1-methyl-3-nitropyrazolyl)-acrylamide.

Provenance & Evidence