Potassium Carbonate → tert-butyl 4-(2-(piperidin-4-yloxy)benzo[d]thiazol-6-yl)-5,6-dihydropyridine-1(2H)-carboxylate

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Reaction Conditions

Reaction Steps

To a degassed mixture of 6-bromo-2-(piperidin-4-yloxy)benzo[d]thiazole (Compound 1B, 400 mg, 1.277 mmol), tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5,6-dihydropyridine-1(2H)-carboxylate (987 mg, 3.19 mmol) and K2CO3 (706 mg, 5.11 mmol) in dioxane (20 mL) and water (6.67 mL) was added Pd(PPh3)4 (148 mg, 0.128 mmol) and the resulting mixture was heated at 95° C. for 3.5 h. The mixture was cooled to room temperature, diluted with water (15 mL), and extracted with EtOAc (3×10 mL). The combined organic layers were washed with brine, dried (Na2SO4), and evaporated. The crude product was purified by column chromatography (silica gel, CH2Cl2-MeOH gradient 0 to 15% MeOH) to afford Compound 50A (460.7 mg, 1.109 mmol, 87% yield) as a light yellow solid. LCMS (m/z)=416 (M+H)+.

Provenance & Evidence