Cysteamine Hydrochloride → 2-{(5-{[N-methyl-N-propargylamino]methyl}-2-furyl)methylthio}ethylamine

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Reaction Steps

A solution of 5-{[N-methyl-N-(2-propynyl)amino]methyl}-2-furanmethanol (40.0 g; 223 mmoles) [prepared in Step A] in 100 ml of ice-cold concentrated HCl was added to a cold (5°) stirred solution of cysteamine hydrochloride (27.9 g; 24.6 mmoles) in 125 ml of concentrated hydrochloric acid. The solution was allowed to stand at 0° for 21/2 days, and then at ambient temperature for 7 hours to complete the reaction. The reaction mixture was cooled in an ice-water bath, diluted with 200 ml of water, made strongly alkaline with 40% aqueous NaOH, and then extracted with three portions of methylene chloride. The combined organic phase was dried, filtered, and evaporated under reduced pressure to give the product as a thick oil (46.4 g). A rapid vacuum distillation of the oil yielded the title compound, bp 136°-140°/0.2 mm Hg.

Provenance & Evidence