Hydrochloric Acid → N6-Propyl-4,5,6,7-tetrahydro-1,3-benzothiazole-2,6-diamine hydrogen chloride (1:2)

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An alternate method for conversion of the sulfonate or halide salts of 2-amino-4,5,6,7-tetrahydro-6-(propylamino)benzothiazole to an HCl salt involves the use of a concentrated solution of HCl and isopropyl acetate (IPAC). A sulfonate or halide salt of 2-amino-4,5,6,7-tetrahydro-6-(propylamino)benzothiazole may be taken up in IPAC and cooled to 15° C. HCl (gas) may be bubbled into the slurry for about 1 hour, after which the mixture may be filtered, washed with IPAC and dried under vacuum at room temperature to afford a 2-amino-4,5,6,7-tetrahydro-6-(propylamino)benzothiazole dihydrochloride salt. A detailed example of this synthesis may be found in Example 9.

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