Trifluoroacetic acid → 2-(1-(5-Fluoropyrimidin-2-yl)piperidin-4-yloxy)-6-(1,2,3,6-tetrahydropyridin-4-yl)benzo[d]thiazole

To a solution of tert-butyl 4-(2-(1-(5-fluoropyrimidin-2-yl)piperidin-4-yloxy)benzo[d]thiazol-6-yl)-5,6-dihydropyridine-1(2H)-carboxylate (1.27 g, 2.482 mmol) in CH2Cl2 (20 mL) was added TFA (1.9 mL, 24.8 mmol). The reaction mixture was stirred at rt overnight. The reaction mixture was diluted with CH2Cl2 (20 mL) and washed sequentially with aq. NaOH (1 N, 30 mL) and brine. The organic layer was dried (Na2SO4), filtered, and concentrated to afford 2-(1-(5-fluoropyrimidin-2-yl)piperidin-4-yloxy)-6-(1,2,3,6-tetrahydropyridin-4-yl)benzo[d]thiazole (1.01 g, 2.459 mmol, 99% yield) as a pale yellow solid. LCMS (m/z)=412 (M+H)+.