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With potassium hydroxide In water; ethyl acetate; toluene |
6.A 5-Bromo-2-(2-pyrrolidin-1-ylethoxy)pyridine
Step A 5-Bromo-2-(2-pyrrolidin-1-ylethoxy)pyridine A solution of 2,5-dibromopyridine (15.0 g, 63.3 mmol), powdered KOH (6.39 g, 114 mmol), 1-(2-hydroxyethyl)pyrrolidine (14.58 g, 126.6 mmol), and 18-crown-6 (300 mg, 1.14 mmol) in dry toluene (100 mL) was heated to 70° C. for 1 h. The solution was cooled to room temperature and water and EtOAc were added. The organic layer was washed with water and brine. The solution was dried (MgSO4), filtered, and concentrated in vacuo. Short path distillation (153° C. ã 0.1 mmHg) provided the title compound as a colorless oil which solidified upon cooling (14.9 g, 87%). 1 H NMR (250 MHz, CDCl3): δ8.15 (d, J=2.4 Hz, 1H), 7.65 (dd, J=2.4, 8.4 Hz, 1H), 6.67 (d, J=8.4 Hz, 1H), 4.38 (t, J=5.8 Hz 2H), 2.84 (t, J=5.8 Hz, 2H), 2.62 (m, 4H), 1.82 (m, 4H). |
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With potassium hydroxide In water; ethyl acetate; toluene |
6.A Step A
Step A 5-Bromo-2-(2-pyrrolidin-1-ylethoxy)pyridine: A solution of 2,5-dibromopyridine (15.0 g, 63.3 mmol), powdered KOH (6.39 g, 114 mmol), 1-(2-hydroxyethyl)pyrrolidine (14.58 g, 126.6 mmol), and 18-crown-6 (300 mg, 1.14 mmol) in dry toluene (100 mL) was heated to 70° C. for 1 h. The solution was cooled to room temperature and water and EtOAc were added. The organic layer was washed with water and brine. The solution was dried (MgSO4), filtered, and concentrated in vacuo. Short path distillation (153° C. ã0.1 mmHg) provided the title compound as a colorless oil which solidified upon cooling (14.9 g, 87%). 1 H NMR (250 MHz, CDCl3): δ 8.15 (d, J=2.4 Hz, 1H), 7.65 (dd, J=2.4, 8.4 Hz, 1H), 6.67 (d, J=8.4 Hz, 1H), 4.38 (t, J=5.8 Hz, 2H), 2.84 (t, J=5.8 Hz, 2H), 2.62 (m, 4H), 1.82 (m, 4H). |
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With potassium hydroxide In water; ethyl acetate; toluene |
6.A Step A
Step A 5-Bromo-2-(2-pyrrolidin-1-ylethoxy)pyridine: A solution of 2,5-dibromopyridine (15.0 g, 63.3 mmol), powdered KOH (6.39 g, 114 mmol), 1-(2-hydroxyethyl)pyrrolidine (14.58 g, 126.6 mmol), and 18-crown-6 (300 mg, 1.14 mmol) in dry toluene (100 mL) was heated to 70°C for 1 h. The solution was cooled to room temperature and water and EtOAc were added. The organic layer was washed with water and brine. The solution was dried (MgSO4), filtered, and concentrated in vacuo.Short path distillation (153°C ã 0.1 mmHg) provided the title compound as a colorless oil which solidified upon cooling (14.9 g, 87%). 1H NMR (250 MHz, CDCl3): δ 8.15 (d, J = 2.4 Hz, 1H), 7.65 (dd, J = 2.4, 8.4 Hz, 1H), 6.67 (d, J = 8.4 Hz, 1H), 4.38 (t, J = 5.8 Hz, 2H), 2.84 (t, J = 5.8 Hz, 2H), 2.62 (m, 4H), 1.82 (m, 4H). |
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With NaH In ethyl acetate; N,N-dimethyl-formamide |
3.15 3.15a 5-bromo-2-(2-pyrrolidin-1-yl-ethoxy)-pyridine
3.15a 5-bromo-2-(2-pyrrolidin-1-yl-ethoxy)-pyridine 280 mg (7.00 mmol, 60%) NaH are added to a solution of 0.76 mL (6.14 mmol) N-(2-hydroxyethyl)pyrrolidine in 20 mL DMF at RT. The reaction solution is stirred for 45 min at RT and then 1.35 g (5,53 mmol) 2,5-dibromopyridine are added. The solution is stirred for 16 h at 70° C. and the solvent is eliminated i.vac. The residue is taken up in 100 mL EtOAc and 50 mL water and the organic phase is extracted with 40 mL saturated NaCl solution. The organic phase is dried over Na2SO4 and the solvent is eliminated i.vac. Further purification is carried out by column chromatography on silica gel (gradient: cyc/EtOAc 1:1 to EtOAc). Yield: 926 mg (61.8% of theory). C11H15BrN2O (M=271.159). |
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