Methanol → 2-Imino-3-{2-[4-(2-methylphenyl)-1-piperazinyl]ethyl}-6-trifluoromethoxybenzothiazoline

関与物質

反応条件

反応手順

Using the procedure described in Example 1, starting with 2-(2-trifluoroacetylimino-6-trifluoromethoxy-3-benzothiazolinyl)ethyl methanesulphonate (5.88 g) in toluene (200 cc) and 4-(2-methylphenyl)piperazine (6.87 g) and after 2 hours under reflux, the toluene filtrate is evaporated under reduced pressure. To the residue thereby obtained, methanol (100 cc) and a 7% strength aqueous-alcoholic solution (20 cc) of potassium carbonate are added and the mixture is stirred for 2 hours at approximately 20° C. The alcohol is evaporated off under reduced pressure and the residue is purified by chromatography on a silica column with a dichloromethane/ethyl acetate mixture (70:30 by volume) as eluent, and then an ethyl acetate/cyclohexane mixture (50:50 by volume) as eluent. 2-Imino-3-{2-[4-(2-methylphenyl)-1-piperazinyl]ethyl}-6-trifluoromethoxybenzothiazoline (1.8 g), m.p. 135° C., is thereby obtained.

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