[Cl-].[Al+3].[Cl-].[Cl-].C[O:6][C:7]1[CH:16]=[CH:15][C:10]2[N:11]=[C:12]([Cl:14])[S:13][C:9]=2[CH:8]=1.Cl>C1(C)C=CC=CC=1>[Cl:14][C:12]1[S:13][C:9]2[CH:8]=[C:7]([OH:6])[CH:16]=[CH:15][C:10]=2[N:11]=1Aluminum chloride (1.98 g, 14.9 mmol) was added to a solution of 6-methoxy-2-chlorobenzothiazole (1.06 g, 5.31 mmol) in toluene (40 mL), and the reaction mixture was heated to 110° C. After 1 h, the reaction mixture was allowed to cool to rt and 1 M aqueous HCl (40 mL) was added. The resulting precipitate was collected by filtration and washed with water (2×), saturated aqueous NaHCO3 (2×) and water (2×). The solid was air-dried, yielding 0.800 g (81%) of the title compound as a brown solid. LC-MS: RT=7.18 min., [M+H]+=185.9.
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