Ethylamine → N-Ethyl-5-nitropyridine-3-sulfonamide

Participants

Reaction Steps

A mixture of 0.5g. of 5-nitro-3-pyridinesulfonic acid, 0.5g. of phosphorous pentachloride and 15 ml. of phosphorous oxychloride was heated under reflux for 6 hours. After removing the solvent by evaporation, dry chloroform was added to give a powdery crystal. After adding the crystal to 2.5 ml. of 20% ethyl amine under cooling, the mixture was stirred for 1 at room temperature. Then, the mixture was diluted with water and extracted with ethyl acetate. The extact was washed with water and dried. After removing the solvent by evaporation and purification by chromatography, 0.2g. of the desired compound was obtained. m.p. 117°-118° C. Similarly, the following compounds were synthesized.

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