Riluzole → 2(3H)-Benzothiazolimine, 3-(cyclopropylmethyl)-6-(trifluoromethoxy)-, monohydrobromide

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The procedure is as in Example 15, starting with 2-amino-6-trifluoromethoxybenzothiazole (9.4 g) and bromomethylcyclopropane (12.7 g) in 2-propanol (30 cc). The mixture is heated for 42 hours to boiling. After cooling of the reaction medium to a temperature in the region of 20° C., the precipitate is filtered off and recrystallized in a boiling mixture (30 cc) of ethyl acetate and methanol (80:20 by volume). 3-Cyclopropylmethyl-2-imino-6-trifluoromethoxybenzothiazoline hydrobromide (1.2 g), m.p. 220° C., is obtained.

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