Patent ID: 6750351
Filing Date: 2004-06-15
Classification: C07D

Abstract:
A method for producing high purity 2-cyanoimino-1,3-thiazolidine comprising the steps of:reacting an alkali metal cyanide compound, an alkali metal hydroxide, a lower alcohol and chlorine in an aqueous solution to form an carboimidic acid ester solution, then adding an organic solvent thereto, followed by adding a cyanamide solution to form an N-cyanocarbonimidic acid ester, and further extracting the resultant ester with an organic solvent extracting solution, followed by washing with an aqueous solution of a reducing agent, whereby a high purity, stable N-cyanocarbonimidic acid ester is obtained as a first step; and reacting the N-cyanocarbonimidic acid ester obtained in the first step with 2-aminoethanethiol to be cyclicized as a second step to thereby obtain a 2-cyanoimino-1,3-thiazolidine.