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Reagents and conditions: (a) methyl 2-amino-4-(1-phenylethoxy)benzo[d]thiazole-6-carboxylate, toluene, 130 °C, 24 h (57% yield); (b) MeOH, 2 M NaOH, 40 °C, 48 h; (c) tert-butyl 2-amino-4-(2-propyloxy)benzo[d]thiazole-6-carboxylate, toluene, 130 °C, 24 h (79% yield); and (d) CF3COOH, DCM, r.t., 24 h (98% yield).
