Triethylamine → N-(alpha-cyanofurfuryl)-2,4-dimethylthiazole-5-carboxylic acid amide

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Reaction Steps

4.71 g of 2,4-dimethylthiazole-5-carboxylic acid was suspended in 70 ml of tetrahydrofuran, and 6.67 g of triethylamine was added. The mixture was stirred. While it was cooled to -10° to -5° C., 4.10 g of n-butyl chloroformate was added, and the mixture was stirred at this temperature for 30 minutes, and then 4.03 g of alpha-(2-furyl)-alpha-aminoacetonitrile hydrochloride was added. The mixture was stirred at room temperature for 5 hours, and then left to stand overnight. The precipitate was separated by filtration and distilled under reduced pressure to remove the solvent. The residue was purified by silica gel column chromatography. Elution with hexane/ethyl acetate gave 4.20 g (yield 53.6%) of the desired N-(alpha-cyanofurfuryl)-2,4-dimethylthiazole-5-carboxylic acid amide.

Provenance & Evidence