Hydrochloric Acid → beta-Oxo-alpha-(2-thiazolylcarbamoyl)-beta-(1-methyl-2-pyrrolyl)propionitrile

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To the suspension of 2.1 g of 50% NaH mineral oil (washed with petroleum ether) in 25 ml of 1,2-dimethoxyethane and 15 ml of dimethylformamide was added 6.7 g of 2-(cyanoacetylamino)thiazole. After the moderately exothermic, effervescent reaction of the hydride, there was added (swirling) a solution of N-methyl-2-pyrroloyl chloride (prepared from 2.5 g of the acid) in 20 ml of 1,2-dimethoxyethane. The dark suspension resulting from the exothermic reaction was let stand overnight. After treatment with ca. 300 ml water, the filtered aqueous solution was acidified with 6 ml of 6 N HCl. The crude product was collected, redissolved in NaHCO3 solution, and the filtered solution carefully acidified with 6 N HCl. The product was collected, washed with water, dried, and triturated with methanol to give crystals, m.p. 201°-2° dec. Recrystallization from dimethylformamide-methanol gave β-oxo-α-(2-thiazolylcarbamoyl)-β-(1-methyl-2-pyrrolyl)propionitrile, m.p. 208°-9° dec.

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