Reaction Steps
A mixture of 6-bromo-2-[2-(2-(R)-methyl-pyrrolidin-1-yl)-ethyl]-benzothiazole (0.3 g, 0.9 mmol), 3-pyridinyl boronic acid (0.17 g, 1.4 mmol) and 2-(dicyclohexylphosphino)biphenyl (65 mg, 0.2 mmol) in 15 mL of IPA was purged with nitrogen. Dichlorobis(triphenylphosphine)palladium II (65 mg, 0.1 mmol) was added. Sodium carbonate (0.15 g, 1.35 mmol) was dissolved in 5 g of water, purged with nitrogen, and added to the above mixture. The mixture was heated to 65° C. under nitrogen for 16 hr. After cooling to room temperature 20 mL of methylene chloride was added and the solid was filtered off. The filtrate was concentrated to oil and dissolved in 10 mL of 2N HCl. The acidic aqueous layer was washed with 10 mL methylene chloride, the pH adjusted with 4N NaOH to pH 10, and the product free base was extracted with 20 mL methylene chloride. The methylene chloride layer was concentrated to dryness and purified by column chromatography (silica gel, 10:90 MeOH:CHCl3) to give the pure 2-[2-(2-Methyl-pyrrolidin-1-yl)-ethyl]-6-pyridin-3-yl-benzothiazole (0.2 g, 67% yield). 1H NMR (CDCl3, 400 MHz) δ 1.14 (d, 3H, J=8 Hz), 1.42-1.51 (m, 1H), 1.71-1.86 (m, 2H), 1.92-2.00 (m, 1H), 2.27 (q, 1H, J=8 Hz), 2.41-2.48 (m, 1H), 2.60-2.67 (m, 1H), 3.22-3.37 (m, 4H), 7.36-7.39 (m, 1H), 7.64 (broad d, 1H, J=8 Hz), 7.90 (broad d, 1H, J=8 Hz), 8.03-8.05 (m, 2H), 8.60 (d, 1H, J=4 Hz), 8.89 (d, 1H, J=1.5 Hz); 13C NMR (CDCl3, 400 MHz) δ 19.3, 22.2, 33.0, 34.0, 52.7, 53.8, 59.9, 119.7, 122.6, 123.3, 125.0, 134.2, 135.9, 136.2, 148.0, 148.1, 152.3, 170.7; (DCl/NH3) m/z 324 (M+H)+.
