Hydrochloric Acid → Benzenamine, 3-(2,3,5,6-tetrahydroimidazo(2,1-b)thiazol-6-yl)-, dihydrochloride, (+-)-

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Reaction Steps

A solution of 1.00 g. (0.0038 mole) of 3'-(2,3,5,6-tetrahydroimidazo[2,1-b]thiazol-6-yl)acetanilide (Example 8) in 17 ml. of 6N hydrochloric acid is heated at reflux for 2.5 hours and then allowed to stand overnight at room temperature. The solution is concentrated at reduced pressure, made basic with concentrated aqueous sodium hydroxide while cooling and then extracted with 3 portions of chloroform. The combined organic layers are washed with brine, dried (sodium sulfate) and evaporated to give 0.84 g. of an oil, i.e., m-aminotetramisole free base. The oil is dissolved in hot methanol and strongly acidified with hydrogen chloride in 2-propanol. Evaporation of the solution and crystallization of the residue from 2-propanol gives 0.91 g. (81%) of cream colored solid, melting point 198°-201° C., dec.

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