反应详情

温度

90 °C

To a reaction flask containing K2CO3 (0.326 g, 1.5 mmol), CsF (0.233 g, 1.5 mmol), and (0.19 g, 1.3 mmol) of 4-cyanophenyl boronic acid was added a solution of 5-bromo-2-[2-(2-methyl-pyrrolidin-1-yl)-ethyl]-benzothiazole (0.25 g, 0.77 mmol) in 3 mL of toluene. The resulting mixture was purged with nitrogen, and then 2-dicyclohexylphosphinobiphenyl (54 mg, 0.15 mmol) and Pd2(dba)3 (70 mg, 0.08 mmol) were added. The resulting reaction mixture was then heated at 90° C. for 2 hr. At completion, the reaction was washed with water, then diluted with with CH2Cl2, and purified by column chromatography (silica gel, 10% MeOH/CH2Cl2), to give 4-{2-[2-(2-methyl-pyrrolidin-1-yl)-ethyl]-benzothiazol-5-yl}-benzonitrile in an isolated yield of 31.5%. The hydrochloride salt of the product was formed by adding 6N HCl (2 equivalents) in isopropanol solution and then diluting with 1 mL of isopropanol, followed by removal of solvent. 1H NMR (400 MHz, Methanol d4) δ 1.47 (d, J=6.45 Hz, 3 H) 1.72 (dd, J=12.76, 8.37 Hz, 1 H) 2.29 (m, 2 H) 3.23 (m, 3 H) 3.36 (t, J=7.14 Hz, 1 H) 3.62 (m, 3 H) 3.99 (m, 1 H) 7.68 (dd, J=8.44, 1.72 Hz, 1 H) 7.77 (m, 4 H) 8.01 (d, J=8.37 Hz, 1 H) 8.17 (d, J=1.51 Hz, 1 H) [M+H]+ at m/z 348.

1. customThe resulting mixture was purged with nitrogen
2. customThe resulting reaction mixture
3. washAt completion, the reaction was washed with water
4. additiondiluted with with CH2Cl2
5. custompurified by column chromatography (silica gel, 10% MeOH/CH2Cl2)